English Vocabulary · Grade 7 Live Review Preview

7th Grade Vocabulary Words

Seventh-grade readers are expected to move confidently among literary analysis, argument, research, science, mathematics, history, and civic discussion. This level develops precise Tier II and cross-curricular language while reinforcing context clues, word relationships, roots and affixes, multiple meanings, source evaluation, and evidence-based speaking and writing.

This independently authored 500-word beta curriculum is arranged in twenty pages of twenty-five words each. Words 1–300 include five cloze questions per page; words 301–500 remain fully visible and editable as list pages while the expanded practice layer is developed. Each row includes a subject-field label and an editable word-study note about a transparent affix, compound structure, capitalization, or dictionary base form. The supplied Grade 7 workbook calibrated difficulty and vocabulary-study skills only; all learner-facing definitions, examples, quizzes, and descriptions are original KSSR copy.

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Page 1: words 1–25

Vocabulary page 1
#	Word	Details	Meaning	Sample sentence
1	specify	verb Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ify commonly forms a verb meaning to make or become.	បញ្ជាក់លម្អិត	The directions specify which measurements belong in the final table.
2	divulge	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: divulge is the dictionary headword; compare its inflected or derived forms in context.	បែកធ្លាយ	The journalist refused to divulge the confidential source's name.
3	align	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: align is the dictionary headword; compare its inflected or derived forms in context.	តម្រឹម	The revised budget must align with the council's stated priorities.
4	speculation	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ការរំពឹងទុក	The rumor remains speculation until a reliable witness confirms it.
5	vary	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: vary is the dictionary headword; compare its inflected or derived forms in context.	ប្រែប្រួល	Daily temperatures vary more in the desert than near the ocean.
6	conviction	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	ការដឹងជាក់ក្នុងចិត្ត ជំនឿស៊ប់ ការប្រកាសទោស	Her conviction that every child deserves books inspired the donation drive.
7	perplexity	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	ភាពច្របូកច្របល់	The contradictory clues left the investigators in perplexity.
8	versatile	adjective Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: versatile is the dictionary headword; compare its inflected or derived forms in context.	ចម្រុះ	A versatile tool can cut wire, tighten screws, and open packages.
9	oppose	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: oppose is the dictionary headword; compare its inflected or derived forms in context.	ប្រឆាំង	Several residents oppose the highway because it would divide the wetland.
10	noncommittal	adjective Study Field: Grade 7 academic reading and reasoning word Word study: Prefix focus: non- means not or without.	មិនធ្វើការ	The director gave a noncommittal reply while the proposal was still under review.
11	unabridged	adjective Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: unabridged is the dictionary headword; compare its inflected or derived forms in context.	មិនសង្ខេប	The library owns an unabridged edition containing every chapter of the novel.
12	irrational	adjective Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: irrational is the dictionary headword; compare its inflected or derived forms in context.	មិនសមហេតុផល	It is irrational to reject the experiment before examining its results.
13	gauge	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: gauge is the dictionary headword; compare its inflected or derived forms in context.	រង្វាស់	The survey helps researchers gauge public support for the park.
14	preview	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: preview is the dictionary headword; compare its inflected or derived forms in context.	1. មើលជាមុន 2. មើលជាមុន	The museum offered a preview of the new exhibit to local teachers.
15	status	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: status is the dictionary headword; compare its inflected or derived forms in context.	ស្ថានភាព	The tracking page shows the delivery status of each package.
16	prerequisite	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: prerequisite is the dictionary headword; compare its inflected or derived forms in context.	តម្រូវការជាមុន	Basic algebra is a prerequisite for the advanced robotics course.
17	presume	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: presume is the dictionary headword; compare its inflected or derived forms in context.	សន្មត	We should not presume that the quietest participant has no ideas.
18	preconceived	adjective Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: preconceived is the dictionary headword; compare its inflected or derived forms in context.	សតិប្បដ្ឋាន	The interview challenged her preconceived view of the neighborhood.
19	documentation	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ឯកសារកម្ម	The application requires documentation of the volunteer hours.
20	version	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: version is the dictionary headword; compare its inflected or derived forms in context.	1. ច្បាប់ 2. កំណែ	The director chose a shorter version of the play for the festival.
21	academic	adjective Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: academic is the dictionary headword; compare its inflected or derived forms in context.	សិក្សា	The article uses academic language but explains each specialized term.
22	precise	adjective Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: precise is the dictionary headword; compare its inflected or derived forms in context.	ត្រឹម	A precise description allowed the technician to locate the fault quickly.
23	competent	adjective Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: competent is the dictionary headword; compare its inflected or derived forms in context.	មានសមត្ថកិច្ច	A competent editor checks facts as well as grammar.
24	inquisitive	adjective Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	ចង់ដឹងចង់ឃើញ	The inquisitive visitor examined every label in the science gallery.
25	principle	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: principle is the dictionary headword; compare its inflected or derived forms in context.	1. គោលការណ៍ 2. មូលភាព	Fairness is the principle behind giving each speaker equal time.

Previewing the Water Report

Reading practice for pages 1–3. Five relevant words are highlighted.

English reading

Before officials divulge a river report, scientists preview its charts. The figures gauge water quality and specify where pollution increased. A colored symbol shows the status of each testing site, making the findings easier to interpret.

Khmer translation

A reviewed translation is not available for this passage yet.

Reading comprehension

1. What do scientists preview?

They preview the river report's charts.

2. What do the figures gauge?

They gauge water quality.

3. What does each symbol show?

Each symbol shows a testing site's status.

Cloze vocabulary quiz

1. The survey helps researchers ___ public support for the park.

Answer: gauge

2. The directions ___ which measurements belong in the final table.

Answer: specify

3. The museum offered a ___ of the new exhibit to local teachers.

Answer: preview

4. The journalist refused to ___ the confidential source's name.

Answer: divulge

5. The tracking page shows the delivery ___ of each package.

Answer: status

Page 2: words 26–50

Vocabulary page 2
#	Word	Details	Meaning	Sample sentence
26	modify	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: modify is the dictionary headword; compare its inflected or derived forms in context.	កែប្រែ	Engineers will modify the design so the ramp is less steep.
27	itemize	verb Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ize commonly forms a verb meaning to make, become, or apply.	ធាតុ	The receipt will itemize every material purchased for the repair.
28	compare	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: compare is the dictionary headword; compare its inflected or derived forms in context.	1. ប្រៀបធៀប 2. ធៀប 3. ទូរ	Readers compare the two accounts before deciding where they agree.
29	categorize	verb Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ize commonly forms a verb meaning to make, become, or apply.	ចាត់ថ្នាក់	Researchers categorize the shells by shape, color, and texture.
30	validate	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: validate is the dictionary headword; compare its inflected or derived forms in context.	ធ្វើឲ្យមានសុពលភាព	A second trial can validate the surprising result.
31	differentiate	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: differentiate is the dictionary headword; compare its inflected or derived forms in context.	បែងចែក	The key helps students differentiate harmless insects from harmful ones.
32	critique	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: critique is the dictionary headword; compare its inflected or derived forms in context.	ការរិះគន់	Partners critique each proposal using the same three criteria.
33	outline	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: outline is the dictionary headword; compare its inflected or derived forms in context.	គ្រោង	Before drafting, Mina will outline the reasons for protecting the marsh.
34	proofread	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: proofread is the dictionary headword; compare its inflected or derived forms in context.	អានឡើងវិញ	Please proofread the report after making the final revisions.
35	organize	verb Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ize commonly forms a verb meaning to make, become, or apply.	1. រៀបចំ 2. ចាត់ចែង	Color-coded folders organize the records by month.
36	prioritize	verb Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ize commonly forms a verb meaning to make, become, or apply.	ផ្តល់អាទិភាព	Emergency crews prioritize people who need immediate medical help.
37	monitor	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: monitor is the dictionary headword; compare its inflected or derived forms in context.	1. កម្មវិធីត្រួតពិនិត្យ 2. កម្មវិធីត្រួតពិនិត្យ 3. ម៉ូនីទ័រ	Sensors monitor the bridge for unusual movement.
38	integrate	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: integrate is the dictionary headword; compare its inflected or derived forms in context.	រួមបញ្ចូល	The presentation will integrate maps, quotations, and survey data.
39	transfer	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: transfer is the dictionary headword; compare its inflected or derived forms in context.	ផ្ទេរ	The cable can transfer the photographs to a computer.
40	define	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: define is the dictionary headword; compare its inflected or derived forms in context.	កំណត់	The opening paragraph should define the problem before proposing a solution.
41	describe	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: describe is the dictionary headword; compare its inflected or derived forms in context.	1. និយាយ 2. រៀបរាប់ 3. រ៉ាយរ៉ាប់	The witness could describe the missing bicycle in detail.
42	respond	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: respond is the dictionary headword; compare its inflected or derived forms in context.	ឆ្លើយតប	The essay must respond directly to the prompt's central question.
43	participate	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: participate is the dictionary headword; compare its inflected or derived forms in context.	1. ចូលរួម 2. មូត 3. រួម	Every student may participate in the discussion by speaking or writing.
44	facilitate	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: facilitate is the dictionary headword; compare its inflected or derived forms in context.	សម្រួល	Clear labels facilitate the safe use of laboratory equipment.
45	persuade	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: persuade is the dictionary headword; compare its inflected or derived forms in context.	បញ្ជោក	Strong evidence may persuade the board to restore the bus route.
46	recommend	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: recommend is the dictionary headword; compare its inflected or derived forms in context.	ផ្ដល់អនុសាសន៍	The committee will recommend the safest location for the crossing.
47	propose	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: propose is the dictionary headword; compare its inflected or derived forms in context.	ស្នើ	The students propose turning the vacant lot into a community garden.
48	inquire	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: inquire is the dictionary headword; compare its inflected or derived forms in context.	សួរ	Visitors can inquire about accessible tours at the front desk.
49	consult	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: consult is the dictionary headword; compare its inflected or derived forms in context.	ពិគ្រោះ	The builders consult an engineer before altering the support beam.
50	resolve	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: resolve is the dictionary headword; compare its inflected or derived forms in context.	ដោះស្រាយ	A neutral mediator helped the neighbors resolve the boundary dispute.

Page 2 vocabulary review

Review five selected words from page 2.

Cloze vocabulary quiz

1. The presentation will ___ maps, quotations, and survey data.

Answer: integrate

2. Engineers will ___ the design so the ramp is less steep.

Answer: modify

3. The cable can ___ the photographs to a computer.

Answer: transfer

4. The receipt will ___ every material purchased for the repair.

Answer: itemize

5. The opening paragraph should ___ the problem before proposing a solution.

Answer: define

Page 3: words 51–75

Vocabulary page 3
#	Word	Details	Meaning	Sample sentence
51	refine	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: refine is the dictionary headword; compare its inflected or derived forms in context.	ចម្រាញ់	Repeated testing will refine the team’s model.
52	transform	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: transform is the dictionary headword; compare its inflected or derived forms in context.	ប្លែង	New lighting can transform the unused warehouse into a theater.
53	contract	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: contract is the dictionary headword; compare its inflected or derived forms in context.	បង្រួញ	Metal may contract when its temperature drops.
54	distribute	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: distribute is the dictionary headword; compare its inflected or derived forms in context.	ចែកចាយ	Volunteers distribute clean water after the storm.
55	separate	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: separate is the dictionary headword; compare its inflected or derived forms in context.	ឃ្លាតចាក	A mesh screen can separate large stones from fine soil.
56	generate	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: generate is the dictionary headword; compare its inflected or derived forms in context.	បង្កើត	The rooftop panels generate electricity on sunny days.
57	reinforce	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: reinforce is the dictionary headword; compare its inflected or derived forms in context.	ពង្រឹង	Steel beams reinforce the old building during earthquakes.
58	highlight	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: highlight is the dictionary headword; compare its inflected or derived forms in context.	បន្លិច	The conclusion should highlight the strongest evidence.
59	perceive	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: perceive is the dictionary headword; compare its inflected or derived forms in context.	យល់	Bats perceive their surroundings through reflected sound.
60	apply	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: apply is the dictionary headword; compare its inflected or derived forms in context.	1. អនុវត្ត 2. អនុវត្ដ	Students apply the formula to a new set of measurements.
61	rehearse	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: rehearse is the dictionary headword; compare its inflected or derived forms in context.	ហាត់សម	The actors rehearse the final scene until every movement is clear.
62	memorize	verb Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ize commonly forms a verb meaning to make, become, or apply.	1. ទន្ទេញ 2. ចាំ	Instead of trying to memorize every line, understand the argument's structure.
63	review	verb Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: review is the dictionary headword; compare its inflected or derived forms in context.	ពិនិត្យឡើងវិញ	Niko will review his notes before writing the summary.
64	credibility	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ibility forms a noun for the capacity to have a quality or perform an action.	ភាពជឿជាក់	Citations and transparent methods increase a report's credibility.
65	counterclaim	noun Study Field: Grade 7 academic reading and reasoning word Word study: Prefix focus: counter- means against, opposing, or responding to.	ការទាមទារសំណង	The essay answers the counterclaim with evidence from two studies.
66	reasoning	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: reasoning is the dictionary headword; compare its inflected or derived forms in context.	ការវែកញែក	The answer is correct, but its reasoning needs clearer steps.
67	inference	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ence commonly forms a noun naming an action, quality, or state.	ការសន្និដ្ឋាន	The muddy footprints support the inference that someone entered from outside.
68	analysis	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: analysis is the dictionary headword; compare its inflected or derived forms in context.	វិភាគ	Her analysis explains how the poem's repeated image develops its theme.
69	quotation	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	មើល Quote	The quotation supports the paragraph because it states the witness's observation.
70	citation	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	អាគតដ្ឋាន	Each borrowed statistic needs a citation.
71	glossary	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: glossary is the dictionary headword; compare its inflected or derived forms in context.	បទានុក្រម	The glossary defines unfamiliar words used in the ecology chapter.
72	appendix	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: appendix is the dictionary headword; compare its inflected or derived forms in context.	ឧបសម្ព័ន្ធ	The report's appendix contains the complete survey questions.
73	bibliography	noun Study Field: Grade 7 academic reading and reasoning word Word study: Root and suffix focus: -graphy relates to writing, recording, or describing.	គន្ថនិទ្ទេស	The bibliography identifies every book, interview, and website in the project.
74	propaganda	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: propaganda is the dictionary headword; compare its inflected or derived forms in context.	ការឃោសនា	The poster used propaganda to portray every critic as an enemy.
75	disinformation	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ព័ត៌មានមិនពិត	Officials corrected the disinformation with verified public records.

Page 3 vocabulary review

Review five selected words from page 3.

Cloze vocabulary quiz

1. Repeated testing will ___ the team’s model.

Answer: refine

2. Citations and transparent methods increase a report's ___.

Answer: credibility

3. New lighting can ___ the unused warehouse into a theater.

Answer: transform

4. The essay answers the ___ with evidence from two studies.

Answer: counterclaim

5. Metal may ___ when its temperature drops.

Answer: contract

Page 4: words 76–100

Vocabulary page 4
#	Word	Details	Meaning	Sample sentence
76	stereotype	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: stereotype is the dictionary headword; compare its inflected or derived forms in context.	ផ្នត់គំនិត ន	The documentary challenges the stereotype with varied personal accounts.
77	interpretation	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ការបកស្រាយអត្ថន័យគម្ពឺរ	Her interpretation of the ending depends on the final image of the open gate.
78	continuity	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	ការបន្ត	Shared symbols create continuity between the novel's three sections.
79	nonfiction	noun Study Field: Grade 7 academic reading and reasoning word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	ប្រឌិត	The nonfiction book explains the expedition using maps and journal entries.
80	narrative	noun Study Field: Grade 7 academic reading and reasoning word Word study: Base-form focus: narrative is the dictionary headword; compare its inflected or derived forms in context.	1. រឿងតំណាល 2. និទានកថា 3. និទានកថា	The oral history presents a personal narrative of migration.
81	fiction	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: fiction is the dictionary headword; compare its inflected or derived forms in context.	ប្រឌិត	The fiction blends an invented family with an accurately researched setting.
82	legend	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: legend is the dictionary headword; compare its inflected or derived forms in context.	1. ព្រេងនិទាន 2. រឿងព្រេង 3. ឥតិហាស	According to the local legend, a hidden bell rings before a storm.
83	mythology	noun Study Field: Grade 7 literature and composition word Word study: Root and suffix focus: -logy means the study of a subject.	ទេវកថាវិទ្យា	The course compares sea deities in Greek and Polynesian mythology.
84	fable	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: fable is the dictionary headword; compare its inflected or derived forms in context.	រឿងល្បើក (ដែលមានសត្វជាតួដើម្បីបង្រៀនសច្ចភាពអ្វីមួយ)	The fable uses a proud crow to warn against empty flattery.
85	memoir	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: memoir is the dictionary headword; compare its inflected or derived forms in context.	អនុស្សាវរីយ៍	In her memoir, the pilot recalls learning to navigate by the stars.
86	biography	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: biography is the dictionary headword; compare its inflected or derived forms in context.	ជីវប្រវត្តិ	The biography traces the scientist's work from childhood experiments to major discoveries.
87	autobiography	noun Study Field: Grade 7 literature and composition word Word study: Root and suffix focus: -graphy relates to writing, recording, or describing.	ជីវប្រវត្តិ	The musician's autobiography describes both failures and successes.
88	drama	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: drama is the dictionary headword; compare its inflected or derived forms in context.	ល្ខោន	The drama reveals its conflict through dialogue and stage directions.
89	comedy	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: comedy is the dictionary headword; compare its inflected or derived forms in context.	ហាសកថា	The comedy turns a series of mistaken identities into a joyful reunion.
90	tragedy	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: tragedy is the dictionary headword; compare its inflected or derived forms in context.	ទារុណកថា	The tragedy shows how the ruler's pride harms the entire city.
91	fantasy	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: fantasy is the dictionary headword; compare its inflected or derived forms in context.	ស្រមើស្រមៃ	The fantasy imagines a library whose books can speak.
92	mystery	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: mystery is the dictionary headword; compare its inflected or derived forms in context.	គំរោងការណ៍លាក់កំបាំង អាថ៌កំបាំង	The mystery provides enough clues for careful readers to identify the thief.
93	adventure	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: adventure is the dictionary headword; compare its inflected or derived forms in context.	ការដើរផ្សងព្រេង	The adventure follows two friends across an unmapped island.
94	romance	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: romance is the dictionary headword; compare its inflected or derived forms in context.	ប្រលោមលោក	The historical romance develops alongside the struggle to save the family farm.
95	realism	noun Study Field: Grade 7 literature and composition word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	បា្រកដនិយម (មើល idealism) ទ្រឹស្តដែលថាវត្ថុនិងតម្លៃសីលធម៌បា្រកដជាមានទោះបីយើងដឹងឬមិនដឹងក៏ដោយ	The novel's realism appears in its detailed portrayal of factory work.
96	dystopia	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: dystopia is the dictionary headword; compare its inflected or derived forms in context.	ឌីស្តូបៀ	The dystopia warns readers about a government that erases personal memories.
97	allegory	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: allegory is the dictionary headword; compare its inflected or derived forms in context.	អត្ថបដិរូប រឿងប្រៀបធៀប (អេសេគាល ១៧:២)	The journey is an allegory about the search for knowledge.
98	narration	noun Study Field: Grade 7 literature and composition word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	វណ្ណនាវិធី	First-person narration limits the reader to one character's knowledge.
99	setting	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: setting is the dictionary headword; compare its inflected or derived forms in context.	ការកំណត់	The isolated lighthouse provides a tense setting for the mystery.
100	plot	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: plot is the dictionary headword; compare its inflected or derived forms in context.	គ្រោង	The plot changes direction when the missing map is discovered.

Comedy and Stereotype

Reading practice for pages 4–6. Five relevant words are highlighted.

English reading

A theater group compares comedy with tragedy. Their interpretation avoids using a harmful stereotype merely for laughter. To preserve continuity, the same actor carries one character’s choices from the first scene to the last.

Khmer translation

A reviewed translation is not available for this passage yet.

Reading comprehension

1. What two forms does the group compare?

The group compares comedy and tragedy.

2. What does their interpretation avoid?

It avoids a harmful stereotype.

3. How do they preserve continuity?

One actor maintains the character's choices throughout.

Cloze vocabulary quiz

1. The documentary challenges the ___ with varied personal accounts.

Answer: stereotype

2. The ___ turns a series of mistaken identities into a joyful reunion.

Answer: comedy

3. Her ___ of the ending depends on the final image of the open gate.

Answer: interpretation

4. The ___ shows how the ruler's pride harms the entire city.

Answer: tragedy

5. Shared symbols create ___ between the novel's three sections.

Answer: continuity

Page 5: words 101–125

Vocabulary page 5
#	Word	Details	Meaning	Sample sentence
101	complication	noun Study Field: Grade 7 literature and composition word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	1. វេជ្ជសាស្ត្រ) ការហក 2. ដង្ហក 3. ការធ្វើទុក្ខ	A sudden flood creates a complication in the travelers' plan.
102	tension	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: tension is the dictionary headword; compare its inflected or derived forms in context.	តង់ស្យុង	The locked door increases the tension as footsteps approach.
103	theme	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: theme is the dictionary headword; compare its inflected or derived forms in context.	1. រូបរាង 2. រូបតំណាងផ្ទាំង 3. ស្បែក	The theme of responsibility develops through each character's choices.
104	character	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: character is the dictionary headword; compare its inflected or derived forms in context.	1. តួអក្សរ 2. តួអង្គ	The youngest character notices the clue that every adult missed.
105	characterization	noun Study Field: Grade 7 literature and composition word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	លក្ខណៈ	The author uses dialogue and actions for indirect characterization.
106	dialogue	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: dialogue is the dictionary headword; compare its inflected or derived forms in context.	សំវាទវិធី	The dialogue reveals that the sisters remember the event differently.
107	monologue	noun Study Field: Grade 7 literature and composition word Word study: Prefix focus: mono- means one or single.	ឯកវាទវិធី	In the monologue, the captain explains why she abandoned the voyage.
108	soliloquy	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: soliloquy is the dictionary headword; compare its inflected or derived forms in context.	ភាពឯកោ	The prince's soliloquy exposes his fear of making the wrong decision.
109	stagecraft	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: stagecraft is the dictionary headword; compare its inflected or derived forms in context.	យានឆាក	Effective stagecraft turns simple fabric and light into an ocean storm.
110	scene	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: scene is the dictionary headword; compare its inflected or derived forms in context.	1. រូបភាព 2. ទស្សនីយភាព 3. ទិដ្ឋភាព	The courtroom scene brings the two opposing witnesses together.
111	act	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: act is the dictionary headword; compare its inflected or derived forms in context.	ទង្វើ	The conflict becomes unavoidable at the end of the second act.
112	stanza	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: stanza is the dictionary headword; compare its inflected or derived forms in context.	ស្តង់ហ្សា	Each stanza describes the river during a different season.
113	verse	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: verse is the dictionary headword; compare its inflected or derived forms in context.	1. ខគម្ពីរ 2. ខគម្ពីរ 3. ខគម្ពីរ	The ballad tells the sailor's story in verse.
114	prose	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: prose is the dictionary headword; compare its inflected or derived forms in context.	1. ពាក្យរាយ 2. ពាក្យលាត 3. ពាក្យសំរាយ ពាក្យរាយ	The author shifts from verse to prose when the formal ceremony ends.
115	couplet	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: couplet is the dictionary headword; compare its inflected or derived forms in context.	គូស្វាមីភរិយា	The poem closes with a rhyming couplet.
116	quatrain	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: quatrain is the dictionary headword; compare its inflected or derived forms in context.	Quatrain	The first quatrain introduces the image of an empty road.
117	meter	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: meter is the dictionary headword; compare its inflected or derived forms in context.	1. បាទ 2. មាត្រា 3. ម៉ែត្រ	The steady meter resembles the beat of marching feet.
118	rhythm	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: rhythm is the dictionary headword; compare its inflected or derived forms in context.	ចង្វាក់	Short repeated phrases give the speech a memorable rhythm.
119	rhyme	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: rhyme is the dictionary headword; compare its inflected or derived forms in context.	1. ឃ្លោង 2. ជួន	The poet avoids perfect rhyme to create an uneasy effect.
120	cadence	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: cadence is the dictionary headword; compare its inflected or derived forms in context.	ចង្វាក់	The sentence's slow cadence matches the character's exhaustion.
121	chorus	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: chorus is the dictionary headword; compare its inflected or derived forms in context.	1. ឆា៎ 2. សាដាន	The chorus comments on events that the main characters cannot see.
122	assonance	noun Study Field: Grade 7 literature and composition word Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state.	ភាពសមហេតុផល	The phrase “low road home” uses assonance to slow the line.
123	consonance	noun Study Field: Grade 7 literature and composition word Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state.	ព្យញ្ជនៈ	The repeated final t sound creates consonance in the short verse.
124	mood	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: mood is the dictionary headword; compare its inflected or derived forms in context.	អារម្មណ៍	Rain and empty streets establish a lonely mood.
125	first-person	adjective Study Field: Grade 7 literature and composition word Word study: Term structure: first + person. Study the complete expression as one field-specific unit.	មនុស្សទីមួយ	The first-person account reveals the explorer's doubts directly.

Page 5 vocabulary review

Review five selected words from page 5.

Cloze vocabulary quiz

1. The author shifts from verse to ___ when the formal ceremony ends.

Answer: prose

2. The locked door increases the ___ as footsteps approach.

Answer: tension

3. The poem closes with a rhyming ___.

Answer: couplet

4. The ___ of responsibility develops through each character's choices.

Answer: theme

5. The first ___ introduces the image of an empty road.

Answer: quatrain

Page 6: words 126–150

Vocabulary page 6
#	Word	Details	Meaning	Sample sentence
126	third-person	adjective Study Field: Grade 7 literature and composition word Word study: Term structure: third + person. Study the complete expression as one field-specific unit.	មនុស្សទីបី	The third-person narrator follows several members of the family.
127	episodic	adjective Study Field: Grade 7 literature and composition word Word study: Base-form focus: episodic is the dictionary headword; compare its inflected or derived forms in context.	Episodic	The episodic novel visits a different town in each chapter.
128	genre	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: genre is the dictionary headword; compare its inflected or derived forms in context.	ប្រភេទ	Readers recognize the detective genre by its clues and investigation.
129	convention	noun Study Field: Grade 7 literature and composition word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	សម្មតិកម្ម	A hidden clue is a common convention of mystery stories.
130	trope	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: trope is the dictionary headword; compare its inflected or derived forms in context.	Trope	The reluctant hero is a trope that writers can use or challenge.
131	inscription	noun Study Field: Grade 7 literature and composition word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	1. ចារឹក 2. អក្សរចារឹក 3. ចំណារ	The weathered inscription names the bridge's original builder.
132	premonition	noun Study Field: Grade 7 literature and composition word Word study: Suffix focus: -ition commonly forms a noun naming an action, process, or result.	បុព្វហេតុ	Her uneasy premonition foreshadows the storm.
133	posterity	noun Study Field: Grade 7 literature and composition word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	កូនចៅ	The archivist preserved the letters for posterity.
134	postscript	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: postscript is the dictionary headword; compare its inflected or derived forms in context.	Postscript	The postscript adds one final clue about the missing key.
135	sentimental	adjective Study Field: Grade 7 literature and composition word Word study: Base-form focus: sentimental is the dictionary headword; compare its inflected or derived forms in context.	មនោសញ្ចេតនា	The worn toy has sentimental value because it belonged to her grandmother.
136	somberly	adverb Study Field: Grade 7 literature and composition word Word study: Suffix focus: -ly commonly forms an adverb describing how an action occurs.	ស្រមោច	The narrator speaks somberly after describing the village's destruction.
137	mock	verb Study Field: Grade 7 literature and composition word Word study: Base-form focus: mock is the dictionary headword; compare its inflected or derived forms in context.	ចំអក	The bullies mock the new student's accent until a friend intervenes.
138	jest	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: jest is the dictionary headword; compare its inflected or derived forms in context.	កំប្លែង	His jest eased the tension without insulting anyone.
139	regal	adjective Study Field: Grade 7 literature and composition word Word study: Base-form focus: regal is the dictionary headword; compare its inflected or derived forms in context.	Regal	The actor's regal posture makes the queen immediately recognizable.
140	glee	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: glee is the dictionary headword; compare its inflected or derived forms in context.	រីករាយ	The children shouted with glee when the curtain rose.
141	camouflage	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: camouflage is the dictionary headword; compare its inflected or derived forms in context.	បន្លំ	The costume designer used leaf-patterned camouflage for the forest spirits.
142	alter	verb Study Field: Grade 7 literature and composition word Word study: Base-form focus: alter is the dictionary headword; compare its inflected or derived forms in context.	ប្ដូរ	The director will alter the ending to fit the shorter performance.
143	idol	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: idol is the dictionary headword; compare its inflected or derived forms in context.	បដិមាករ ព្រះក្លែងក្លាយ	The novel questions whether a famous athlete should become an unquestioned idol.
144	heir	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: heir is the dictionary headword; compare its inflected or derived forms in context.	ទាយាទ	The missing heir returns just before the estate is sold.
145	principal	noun Study Field: Grade 7 literature and composition word Word study: Base-form focus: principal is the dictionary headword; compare its inflected or derived forms in context.	1. សិក្សាភិរក្សវិទ្យាល័យ 2. អគ្គានុរក្ស 3. នាយកវិទ្យាល័យ	The principal character must decide whether to reveal the secret.
146	biome	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: biome is the dictionary headword; compare its inflected or derived forms in context.	ជីវមាត្រ	The tundra biome supports mosses, lichens, and cold-adapted animals.
147	variation	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	បំរែបំរួល	Color variation helps some beetles blend into different backgrounds.
148	genetics	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: genetics is the dictionary headword; compare its inflected or derived forms in context.	ពន្ធុវិទ្យា	Genetics can help explain why related plants share certain features.
149	gene	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: gene is the dictionary headword; compare its inflected or derived forms in context.	1. កត្តាបន្តពូជ 2. ហ្សែន 3. សែន	A gene may influence the color of a flower.
150	allele	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: allele is the dictionary headword; compare its inflected or derived forms in context.	អាឡែល	An offspring receives one allele for the trait from each parent.

Page 6 vocabulary review

Review five selected words from page 6.

Cloze vocabulary quiz

1. The actor's ___ posture makes the queen immediately recognizable.

Answer: regal

2. The ___ novel visits a different town in each chapter.

Answer: episodic

3. The children shouted with ___ when the curtain rose.

Answer: glee

4. Readers recognize the detective ___ by its clues and investigation.

Answer: genre

5. The costume designer used leaf-patterned ___ for the forest spirits.

Answer: camouflage

Page 7: words 151–175

Vocabulary page 7
#	Word	Details	Meaning	Sample sentence
151	mutation	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	កំលាយភេទ	A mutation may be harmful, helpful, or have no visible effect.
152	selection	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	ជម្រើស	Natural selection favors traits that improve survival and reproduction.
153	evolution	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	1. ការវិវត្តន៍ 2. វិវត្តន៍ ការវិវត្ត	Fossils provide evidence of evolution over long periods.
154	parasitism	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	ប៉ារ៉ាស៊ីត	A tick feeding on a deer is an example of parasitism.
155	mutualism	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	លទ្ធិគ្នាទៅវិញទៅមក	Bees and flowering plants often participate in mutualism.
156	commensalism	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	Commensalism	A bird nesting in a tree may illustrate commensalism.
157	nucleus	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: nucleus is the dictionary headword; compare its inflected or derived forms in context.	ណ្វៃយ៉ូ	The nucleus directs many activities of a eukaryotic cell.
158	cytoplasm	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: cytoplasm is the dictionary headword; compare its inflected or derived forms in context.	ស៊ីតូប្លាស្មា	Chemical reactions occur throughout the cytoplasm.
159	skeletal	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: skeletal is the dictionary headword; compare its inflected or derived forms in context.	គ្រោងឆ្អឹង	The skeletal system protects organs and provides support.
160	muscular	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: muscular is the dictionary headword; compare its inflected or derived forms in context.	សាច់ដុំ	The muscular system pulls on bones to create movement.
161	digestive	adjective Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	ការរំលាយអាហារ	The digestive system begins processing food in the mouth.
162	endocrine	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: endocrine is the dictionary headword; compare its inflected or derived forms in context.	អង់ដូគ្រីន	The endocrine system helps regulate growth and metabolism.
163	immune	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: immune is the dictionary headword; compare its inflected or derived forms in context.	1. ដែលមានភាពស៊ាំ 2. មានភាពស៊ាំ 3. ដែលមានភាពស៊ាំប្រឆាំងរោគ	An immune response targets a harmful pathogen.
164	bacterium	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: bacterium is the dictionary headword; compare its inflected or derived forms in context.	បាក់តេរី	One bacterium can reproduce quickly under favorable conditions.
165	nutrition	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ition commonly forms a noun naming an action, process, or result.	បោសនា	Balanced nutrition supplies energy and essential nutrients.
166	puberty	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: puberty is the dictionary headword; compare its inflected or derived forms in context.	ភាពពេញវ័យ	Hormones cause many physical changes during puberty.
167	embryo	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: embryo is the dictionary headword; compare its inflected or derived forms in context.	1. គភ៌ 2. ជីវាណូ 3. ភ្រូណ	The plant embryo is protected inside the seed.
168	ecology	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: ecology is the dictionary headword; compare its inflected or derived forms in context.	1. បរិស្ថានវិទ្យា 2. និវេសវិទ្យា (សៀម 3. អេកូឡូស៊ី	Ecology examines how water quality affects an entire food web.
169	contamination	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ការចម្លងរោគ	Testing revealed bacterial contamination in the well.
170	crystal	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: crystal is the dictionary headword; compare its inflected or derived forms in context.	1. ផលិក 2. ផ្លេក	Each salt crystal has a regular cubic shape.
171	epicenter	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: epicenter is the dictionary headword; compare its inflected or derived forms in context.	ចំណុចកណ្តាល	Shaking was strongest near the earthquake's epicenter.
172	seismic	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: seismic is the dictionary headword; compare its inflected or derived forms in context.	រញ្ជួយដី	Seismic waves allow scientists to study Earth's interior.
173	tsunami	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: tsunami is the dictionary headword; compare its inflected or derived forms in context.	ស៊ូណាមិ	The offshore earthquake triggered a tsunami warning.
174	troposphere	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: troposphere is the dictionary headword; compare its inflected or derived forms in context.	1. ត្រូប៉ូស្វ៊ែរ 2. ស្រទាប់បរិយាកាសក្រោមបំផុត	Clouds and storms form mainly in the troposphere.
175	stratosphere	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: stratosphere is the dictionary headword; compare its inflected or derived forms in context.	1. ស្ត្រាតូស្វ៊ែរ 2. ស្រទាប់បរិយាកាសខាងលើត្រូប៉ូស្វ៊ែរ	Weather balloons can rise into the stratosphere.

Changes in a Pond

Reading practice for pages 7–9. Five relevant words are highlighted.

English reading

A pond study follows frogs from tadpoles through puberty. Good nutrition supports their growth, while parasitism can weaken them. Across many generations, natural selection influences evolution by favoring traits that help frogs survive local conditions.

Khmer translation

A reviewed translation is not available for this passage yet.

Reading comprehension

1. What supports frog growth?

Good nutrition supports frog growth.

2. What can weaken frogs?

Parasitism can weaken frogs.

3. How does selection influence evolution?

It favors traits that help organisms survive.

Cloze vocabulary quiz

1. Natural ___ favors traits that improve survival and reproduction.

Answer: selection

2. Balanced ___ supplies energy and essential nutrients.

Answer: nutrition

3. Fossils provide evidence of ___ over long periods.

Answer: evolution

4. Hormones cause many physical changes during ___.

Answer: puberty

5. A tick feeding on a deer is an example of ___.

Answer: parasitism

Page 8: words 176–200

Vocabulary page 8
#	Word	Details	Meaning	Sample sentence
176	weather	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: weather is the dictionary headword; compare its inflected or derived forms in context.	1. ធាតុអាកាស 2. អាកាសធាតុ	Today's weather includes strong wind and scattered rain.
177	drought	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: drought is the dictionary headword; compare its inflected or derived forms in context.	1. រាំងរំហួត 2. រាំងរឹះ	The drought lowered reservoirs and damaged crops.
178	cyclone	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: cyclone is the dictionary headword; compare its inflected or derived forms in context.	ព្យុះស៊ីក្លូន	The satellite image shows the cyclone turning over warm water.
179	hurricane	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: hurricane is the dictionary headword; compare its inflected or derived forms in context.	ខ្យល់ព្យុះ	The hurricane strengthened before reaching the coast.
180	tornado	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: tornado is the dictionary headword; compare its inflected or derived forms in context.	ខ្យល់ព្យុះ	The tornado damaged a narrow path through the town.
181	tide	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: tide is the dictionary headword; compare its inflected or derived forms in context.	ជំនោរ	The falling tide exposed pools among the rocks.
182	weight	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: weight is the dictionary headword; compare its inflected or derived forms in context.	ទម្ងន់	An astronaut's weight changes with gravity, but her mass does not.
183	buoyancy	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: buoyancy is the dictionary headword; compare its inflected or derived forms in context.	ភាពធន់	Buoyancy keeps the empty bottle floating.
184	pressure	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: pressure is the dictionary headword; compare its inflected or derived forms in context.	1. សម្ពាធ 2. ការពារ	Air pressure decreases as elevation increases.
185	potential	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: potential is the dictionary headword; compare its inflected or derived forms in context.	1. សក្ដានុពល 2. កំលាំងប្រើការបាន	The raised book has gravitational potential because it can fall.
186	thermal	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: thermal is the dictionary headword; compare its inflected or derived forms in context.	កំដៅ	A thermal camera detects differences in surface temperature.
187	electrical	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: electrical is the dictionary headword; compare its inflected or derived forms in context.	អគ្គិសនី	The electrical circuit opens when the switch is lifted.
188	nuclear	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: nuclear is the dictionary headword; compare its inflected or derived forms in context.	1. នុយក្លេអ៊ែរ 2. បរមាណូ	A nuclear reaction changes an atom's nucleus.
189	radiant	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: radiant is the dictionary headword; compare its inflected or derived forms in context.	រស្មី	The Sun provides radiant energy to Earth.
190	sound	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: sound is the dictionary headword; compare its inflected or derived forms in context.	1. សំឡេង 2. ត្រឹមត្រូវ 3. សូរ	Sound travels faster through water than through air.
191	amplitude	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: amplitude is the dictionary headword; compare its inflected or derived forms in context.	1. អំព្លីទីត 2. ទំហំវិសេសវិសាល	Greater amplitude usually makes a sound seem louder.
192	absorption	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	1. ការស្រូបចូល 2. ការបញ្ចូលជាសាខា (សេដ្ឋកិច្ច	Dark fabric has greater absorption of visible light than white fabric.
193	conduction	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	ការអនុវត្ត	The metal spoon warms by conduction.
194	radiation	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	រស្មី	Solar radiation can travel through empty space.
195	voltage	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: voltage is the dictionary headword; compare its inflected or derived forms in context.	តង់ស្យុង	Increasing the voltage made the bulb glow brighter.
196	solvent	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: solvent is the dictionary headword; compare its inflected or derived forms in context.	សារធាតុរំលាយ	Water acts as the solvent in a sugar solution.
197	acid	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: acid is the dictionary headword; compare its inflected or derived forms in context.	1. អាស៊ីត 2. ក្រុត	Lemon juice contains an acid called citric acid.
198	neutralization	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	អព្យាក្រឹតភាព	The neutralization produced water and a salt.
199	periodic	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: periodic is the dictionary headword; compare its inflected or derived forms in context.	តាមកាលកំណត់	A swinging pendulum has periodic motion.
200	laboratory	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: laboratory is the dictionary headword; compare its inflected or derived forms in context.	ទីពិសោធ	The samples remained sealed until they reached the laboratory.

Page 8 vocabulary review

Review five selected words from page 8.

Cloze vocabulary quiz

1. The ___ lowered reservoirs and damaged crops.

Answer: drought

2. ___ travels faster through water than through air.

Answer: sound

3. The satellite image shows the ___ turning over warm water.

Answer: cyclone

4. Greater ___ usually makes a sound seem louder.

Answer: amplitude

5. The ___ strengthened before reaching the coast.

Answer: hurricane

Page 9: words 201–225

Vocabulary page 9
#	Word	Details	Meaning	Sample sentence
201	apparatus	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: apparatus is the dictionary headword; compare its inflected or derived forms in context.	ឧបករណ៍	The filtration apparatus includes a funnel, paper, and collection flask.
202	control	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: control is the dictionary headword; compare its inflected or derived forms in context.	1. ការគ្រប់គ្រង 2. វត្ថុបញ្ជា	The untreated plant served as the control.
203	constant	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: constant is the dictionary headword; compare its inflected or derived forms in context.	ថេរ	Water volume was a constant in every trial.
204	measurement	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	រង្វាស់	Record each measurement to the nearest millimeter.
205	accuracy	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: accuracy is the dictionary headword; compare its inflected or derived forms in context.	កម្រិតត្រឹមត្រូវ	Calibration improved the thermometer's accuracy.
206	error	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: error is the dictionary headword; compare its inflected or derived forms in context.	1. កំហុស 2. បញ្ហា	Reading the scale from an angle can introduce error.
207	hazard	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: hazard is the dictionary headword; compare its inflected or derived forms in context.	គ្រោះថ្នាក់	Loose wires create an electrical hazard.
208	toxic	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: toxic is the dictionary headword; compare its inflected or derived forms in context.	ពុល	The label warns that the liquid is toxic if swallowed.
209	corrosive	adjective Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	ច្រេះ	Technicians wear gloves when handling the corrosive acid.
210	flammable	adjective Study Field: Grade 7 science and engineering word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	ងាយឆេះ	Store the flammable solvent away from sparks.
211	microscope	noun Study Field: Grade 7 science and engineering word Word study: Prefix focus: micro- means small.	1. អតិសុខុមទស្សន៍ 2. មីក្រូទស្សន៍	The microscope revealed cell walls in the onion tissue.
212	specimen	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: specimen is the dictionary headword; compare its inflected or derived forms in context.	បដិរូប	The rock specimen contains visible quartz crystals.
213	dissection	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	ការកាត់	The flower dissection revealed its reproductive parts.
214	model	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: model is the dictionary headword; compare its inflected or derived forms in context.	ម៉ូដែល	The globe is a model of Earth, not an exact copy.
215	simulation	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ការធ្វើតាម	The computer simulation predicts how traffic may flow.
216	engineering	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: engineering is the dictionary headword; compare its inflected or derived forms in context.	វិស្វកម្ម	Bridge engineering balances strength, cost, and safety.
217	optimization	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	បង្កើនប្រសិទ្ធភាព	Route optimization reduced both travel time and fuel use.
218	machine	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: machine is the dictionary headword; compare its inflected or derived forms in context.	1. យន្ត 2. គ្រឿង 3. ម៉ាស៊ីន	The simple machine lets one person lift the heavy crate.
219	lever	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: lever is the dictionary headword; compare its inflected or derived forms in context.	1. គម្នាស់ 2. ដងថ្លឹង	The crowbar acts as a lever when lifting the lid.
220	pulley	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: pulley is the dictionary headword; compare its inflected or derived forms in context.	រ៉ក	A pulley helped raise the flag.
221	gear	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: gear is the dictionary headword; compare its inflected or derived forms in context.	ស្ពឺ	The smaller gear turns faster than the larger gear.
222	axle	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: axle is the dictionary headword; compare its inflected or derived forms in context.	ភ្លៅ	The bicycle wheel rotates around its axle.
223	wedge	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: wedge is the dictionary headword; compare its inflected or derived forms in context.	បន្លួញ	The blade is a wedge that pushes material apart.
224	efficiency	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: efficiency is the dictionary headword; compare its inflected or derived forms in context.	ប្រសិទ្ធភាព	Lubrication increased the motor's efficiency.
225	code	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: code is the dictionary headword; compare its inflected or derived forms in context.	កូដ	The code tells the sensor when to activate the alarm.

Page 9 vocabulary review

Review five selected words from page 9.

Cloze vocabulary quiz

1. The computer ___ predicts how traffic may flow.

Answer: simulation

2. Water volume was a ___ in every trial.

Answer: constant

3. Bridge ___ balances strength, cost, and safety.

Answer: engineering

4. Record each ___ to the nearest millimeter.

Answer: measurement

5. Route ___ reduced both travel time and fuel use.

Answer: optimization

Page 10: words 226–250

Vocabulary page 10
#	Word	Details	Meaning	Sample sentence
226	input	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: input is the dictionary headword; compare its inflected or derived forms in context.	1. ចូល 2. បញ្ចូល	The microphone converts sound input into an electrical signal.
227	output	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: output is the dictionary headword; compare its inflected or derived forms in context.	1. លទ្ធផល 2. ចេញ 3. បញ្ចេញ	The screen displays the sensor's output as a graph.
228	sensor	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: sensor is the dictionary headword; compare its inflected or derived forms in context.	ឧបករណ៍ចាប់សញ្ញា	A light sensor turns the lamp on at dusk.
229	robotics	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: robotics is the dictionary headword; compare its inflected or derived forms in context.	រូបយន្តវិទ្យា	Robotics combines programming, mechanics, and electronics.
230	automation	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	1. ស្វ័យប្រវត្តិកម្ម 2. ស្វ័យប្រតិកម្ម	Automation allows the greenhouse to adjust watering overnight.
231	hydroelectric	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: hydroelectric is the dictionary headword; compare its inflected or derived forms in context.	វារីអគ្គិសនី	The hydroelectric station uses falling water to turn turbines.
232	solar	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: solar is the dictionary headword; compare its inflected or derived forms in context.	1. ដែល 2. បែប 3. នៃសុរិយគតិ	A solar cooker concentrates sunlight to heat food.
233	geothermal	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: geothermal is the dictionary headword; compare its inflected or derived forms in context.	កំដៅផែនដី	The town uses geothermal energy from underground hot water.
234	turbine	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: turbine is the dictionary headword; compare its inflected or derived forms in context.	តួប៊ីន	Steam spins the turbine inside the power plant.
235	generator	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: generator is the dictionary headword; compare its inflected or derived forms in context.	ម៉ាស៊ីនភ្លើង	The bicycle generator powers the headlamp.
236	antidote	noun Study Field: Grade 7 science and engineering word Word study: Base-form focus: antidote is the dictionary headword; compare its inflected or derived forms in context.	ថ្នាំបន្សាប	Doctors administered the antidote soon after identifying the toxin.
237	malfunction	noun Study Field: Grade 7 science and engineering word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	ធ្វើការខុសប្រក្រតី	A sensor malfunction caused the false alarm.
238	auditory	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: auditory is the dictionary headword; compare its inflected or derived forms in context.	សវនកម្ម	The auditory nerve carries signals from the inner ear.
239	inaudible	adjective Study Field: Grade 7 science and engineering word Word study: Suffix focus: -ible means capable of, suitable for, or able to be affected.	ស្តាប់មិនបាន	The bat's highest calls are inaudible to human ears.
240	propel	verb Study Field: Grade 7 science and engineering word Word study: Base-form focus: propel is the dictionary headword; compare its inflected or derived forms in context.	ជំរុញ	Expelled air can propel the balloon across the room.
241	saturate	verb Study Field: Grade 7 science and engineering word Word study: Base-form focus: saturate is the dictionary headword; compare its inflected or derived forms in context.	តិត្ថិភាព	Continued rain will saturate the soil.
242	lethal	adjective Study Field: Grade 7 science and engineering word Word study: Base-form focus: lethal is the dictionary headword; compare its inflected or derived forms in context.	ដ៍សាហាវ	Even a small dose of the chemical can be lethal to fish.
243	rational	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: rational is the dictionary headword; compare its inflected or derived forms in context.	សនិទាន	The decimal 0.75 is rational because it equals three fourths.
244	positive	adjective Study Field: Grade 7 mathematics and data word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	ភាពវិជ្ជមាន	A positive number appears to the right of zero on a number line.
245	term	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: term is the dictionary headword; compare its inflected or derived forms in context.	ពាក្យ	The expression has three terms, and each term is separated by a plus sign.
246	substitute	verb Study Field: Grade 7 mathematics and data word Word study: Base-form focus: substitute is the dictionary headword; compare its inflected or derived forms in context.	ជំនួស	Substitute six for x before simplifying the expression.
247	difference	noun Study Field: Grade 7 mathematics and data word Word study: Suffix focus: -ence commonly forms a noun naming an action, quality, or state.	1. នានត្ត 2. ខុសគ្នា 3. ផលដក	The difference between twenty and thirteen is seven.
248	percent	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: percent is the dictionary headword; compare its inflected or derived forms in context.	ភាគរយ	Twenty-five percent is equivalent to one fourth.
249	theoretical	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: theoretical is the dictionary headword; compare its inflected or derived forms in context.	ទ្រឹស្ដី	The theoretical probability of rolling a six is one sixth.
250	experimental	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: experimental is the dictionary headword; compare its inflected or derived forms in context.	សាកល្បង	Our experimental probability changed as we repeated the toss.

A Rescue Robot

Reading practice for pages 10–12. Five relevant words are highlighted.

English reading

The robotics team designs a machine for flooded buildings. A water sensor warns when soaked floors begin to saturate its wheels. Small fans propel the robot around obstacles so rescuers can inspect a room without entering a potentially lethal space.

Khmer translation

A reviewed translation is not available for this passage yet.

Reading comprehension

1. What does the sensor detect?

The sensor detects water.

2. What can saturate the wheels?

Floodwater can saturate the wheels.

3. Why might the robot enter first?

It can inspect a potentially lethal space safely.

Cloze vocabulary quiz

1. Expelled air can ___ the balloon across the room.

Answer: propel

2. A light ___ turns the lamp on at dusk.

Answer: sensor

3. Continued rain will ___ the soil.

Answer: saturate

4. ___ combines programming, mechanics, and electronics.

Answer: robotics

5. Even a small dose of the chemical can be ___ to fish.

Answer: lethal

Page 11: words 251–275

Vocabulary page 11
#	Word	Details	Meaning	Sample sentence
251	statistics	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: statistics is the dictionary headword; compare its inflected or derived forms in context.	ស្ថិតិ	Statistics can reveal patterns that individual values do not show.
252	random	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: random is the dictionary headword; compare its inflected or derived forms in context.	ចៃដន្យ	A random sample reduces the influence of personal choice.
253	biased	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: biased is the dictionary headword; compare its inflected or derived forms in context.	លំអៀង	A biased question can distort survey results.
254	percentile	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: percentile is the dictionary headword; compare its inflected or derived forms in context.	ភាគរយ	A score in the eightieth percentile equals or exceeds eighty percent of scores.
255	distribution	noun Study Field: Grade 7 mathematics and data word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	ការចែកចាយ	The distribution has two clusters and one distant outlier.
256	histogram	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: histogram is the dictionary headword; compare its inflected or derived forms in context.	អ៊ីស្តូក្រាម	The histogram groups heights into five-centimeter intervals.
257	scatterplot	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: scatterplot is the dictionary headword; compare its inflected or derived forms in context.	ខ្ចាត់ខ្ចាយ	The scatterplot suggests that study time and scores rise together.
258	correlation	noun Study Field: Grade 7 mathematics and data word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ទំនាក់ទំនង	A correlation does not by itself prove that one variable causes the other.
259	trend	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: trend is the dictionary headword; compare its inflected or derived forms in context.	1. របត់ 2. ចំណុចរបត់	The graph shows an upward trend in average temperature.
260	slope	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: slope is the dictionary headword; compare its inflected or derived forms in context.	ចំណោត	The line's slope is two because y rises two units for every unit of x.
261	linear	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: linear is the dictionary headword; compare its inflected or derived forms in context.	លីនេអ៊ែរ	A linear relationship adds the same amount at each step.
262	nonlinear	adjective Study Field: Grade 7 mathematics and data word Word study: Prefix focus: non- means not or without.	មិនលីនេអ៊ែរ	The curved graph represents a nonlinear relationship.
263	dependent	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: dependent is the dictionary headword; compare its inflected or derived forms in context.	អាស្រ័យ	Plant height is the dependent variable in the experiment.
264	domain	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: domain is the dictionary headword; compare its inflected or derived forms in context.	ដែន	Negative numbers are outside the domain when x represents elapsed time.
265	geometry	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: geometry is the dictionary headword; compare its inflected or derived forms in context.	1. រេខាគណិត 2. ធរណីមាត្រ	Geometry helps architects calculate angles and areas.
266	point	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: point is the dictionary headword; compare its inflected or derived forms in context.	ចំណុច	Label the point where the two lines intersect.
267	plane	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: plane is the dictionary headword; compare its inflected or derived forms in context.	1. ផ្ទៃរាប 2. ផ្ទៃរាប	Three noncollinear points determine a plane.
268	segment	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: segment is the dictionary headword; compare its inflected or derived forms in context.	ចម្រៀក	Measure the segment from A to B.
269	ray	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: ray is the dictionary headword; compare its inflected or derived forms in context.	រស្មី	Each side of an angle is a ray extending from the vertex.
270	obtuse	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: obtuse is the dictionary headword; compare its inflected or derived forms in context.	ទាល	The open book forms an obtuse angle.
271	complementary	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: complementary is the dictionary headword; compare its inflected or derived forms in context.	បំពេញបន្ថែម	Angles of thirty and sixty degrees are complementary.
272	supplementary	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: supplementary is the dictionary headword; compare its inflected or derived forms in context.	បន្ថែម	The adjacent angles on a straight line are supplementary.
273	vertical	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: vertical is the dictionary headword; compare its inflected or derived forms in context.	បញ្ឈរ	Vertical angles always have equal measures.
274	transversal	noun Study Field: Grade 7 mathematics and data word Word study: Prefix focus: trans- means across, through, or beyond.	ឆ្លងកាត់	The transversal creates corresponding angles at both intersections.
275	congruent	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: congruent is the dictionary headword; compare its inflected or derived forms in context.	ស្រប	The two triangles are congruent because all corresponding sides and angles match.

Page 11 vocabulary review

Review five selected words from page 11.

Cloze vocabulary quiz

1. A ___ question can distort survey results.

Answer: biased

2. Label the ___ where the two lines intersect.

Answer: point

3. A score in the eightieth ___ equals or exceeds eighty percent of scores.

Answer: percentile

4. Three noncollinear points determine a ___.

Answer: plane

5. The ___ has two clusters and one distant outlier.

Answer: distribution

Page 12: words 276–300

Vocabulary page 12
#	Word	Details	Meaning	Sample sentence
276	similar	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: similar is the dictionary headword; compare its inflected or derived forms in context.	ដូច	The similar rectangles have different sizes but equal angle measures.
277	translation	noun Study Field: Grade 7 mathematics and data word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	1. ការបកប្រែក 2. ការបកប្រែ	The translation moves the triangle four units to the right.
278	dilation	noun Study Field: Grade 7 mathematics and data word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	ការពង្រីក	A dilation with a factor of two doubles every length.
279	quadrilateral	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: quadrilateral is the dictionary headword; compare its inflected or derived forms in context.	ចតុកោណ	A kite is a quadrilateral with two pairs of adjacent equal sides.
280	square	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: square is the dictionary headword; compare its inflected or derived forms in context.	ការេ	The square has both rectangle and rhombus properties.
281	parallelogram	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: parallelogram is the dictionary headword; compare its inflected or derived forms in context.	ប៉ារ៉ាឡែល	Opposite angles of a parallelogram are congruent.
282	pentagon	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: pentagon is the dictionary headword; compare its inflected or derived forms in context.	បញ្ចកោណ	The irregular pentagon still has exactly five sides.
283	hexagon	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: hexagon is the dictionary headword; compare its inflected or derived forms in context.	ឆកោណ	A regular hexagon can be divided into six equilateral triangles.
284	octagon	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: octagon is the dictionary headword; compare its inflected or derived forms in context.	អដ្ឋកោន	The stop sign has the shape of a regular octagon.
285	circle	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: circle is the dictionary headword; compare its inflected or derived forms in context.	1. វង់មូល 2. មណ្ឌល 3. វង់	Every radius of the circle has the same length.
286	pi	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: pi is the dictionary headword; compare its inflected or derived forms in context.	ពី	Use pi to calculate the circumference from the diameter.
287	prism	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: prism is the dictionary headword; compare its inflected or derived forms in context.	ព្រីស	The triangular prism has two triangular bases.
288	pyramid	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: pyramid is the dictionary headword; compare its inflected or derived forms in context.	ពីរ៉ាមីត	The square pyramid has four triangular side faces.
289	cylinder	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: cylinder is the dictionary headword; compare its inflected or derived forms in context.	ស៊ីឡាំង	The can is approximately a cylinder.
290	cone	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: cone is the dictionary headword; compare its inflected or derived forms in context.	កោណ	The traffic cone has a circular base.
291	sphere	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: sphere is the dictionary headword; compare its inflected or derived forms in context.	ស្វ៊ែរ	A basketball approximates a sphere.
292	theorem	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: theorem is the dictionary headword; compare its inflected or derived forms in context.	ទ្រឹស្ដីបទ	The Pythagorean theorem relates the sides of a right triangle.
293	postulate	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: postulate is the dictionary headword; compare its inflected or derived forms in context.	ប្រកាស	The postulate states that exactly one line passes through two points.
294	deduction	noun Study Field: Grade 7 mathematics and data word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	អនុមានញែក	Her deduction follows from the angle-sum theorem.
295	induction	noun Study Field: Grade 7 mathematics and data word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	អនុមានរួម	Induction suggests the pattern, but a proof must confirm it.
296	counterexample	noun Study Field: Grade 7 mathematics and data word Word study: Prefix focus: counter- means against, opposing, or responding to.	ឧទាហរណ៍ផ្ទុយ	The fraction one half is a counterexample to the claim that all numbers below one are negative.
297	calculation	noun Study Field: Grade 7 mathematics and data word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	គណនា	Check the calculation by estimating the result first.
298	mixed	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: mixed is the dictionary headword; compare its inflected or derived forms in context.	លាយ	The mixed number two and one third equals seven thirds.
299	improper	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: improper is the dictionary headword; compare its inflected or derived forms in context.	មិនសមរម្យ	The improper fraction nine fourths is greater than one.
300	terminating	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: terminating is the dictionary headword; compare its inflected or derived forms in context.	ការបញ្ចប់	One eighth has the terminating decimal 0.125.

Page 12 vocabulary review

Review five selected words from page 12.

Cloze vocabulary quiz

1. A ___ with a factor of two doubles every length.

Answer: dilation

2. A basketball approximates a ___.

Answer: sphere

3. A kite is a ___ with two pairs of adjacent equal sides.

Answer: quadrilateral

4. The Pythagorean ___ relates the sides of a right triangle.

Answer: theorem

5. The ___ has both rectangle and rhombus properties.

Answer: square

Page 13: words 301–325

Vocabulary page 13
#	Word	Details	Meaning	Sample sentence
301	repeating	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: repeating is the dictionary headword; compare its inflected or derived forms in context.	ធ្វើម្តងទៀត	One third has the repeating decimal 0.333.
302	conversion	noun Study Field: Grade 7 mathematics and data word Word study: Suffix focus: -sion commonly forms a noun naming an action, process, or result.	ការក្លាយជាគ្រីស្ទបរិស័ទ	The conversion from meters to centimeters multiplies the value by one hundred.
303	metric	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: metric is the dictionary headword; compare its inflected or derived forms in context.	ម៉ែត្រ	The metric unit for liquid volume is the liter.
304	customary	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: customary is the dictionary headword; compare its inflected or derived forms in context.	ទំនៀមទំលាប់	In the customary system, twelve inches equal one foot.
305	formula	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: formula is the dictionary headword; compare its inflected or derived forms in context.	រូបមន្ត	The formula gives the area of a triangle.
306	computation	noun Study Field: Grade 7 mathematics and data word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ការគណនា	A calculator can speed the computation but cannot choose the correct method.
307	arithmetic	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: arithmetic is the dictionary headword; compare its inflected or derived forms in context.	គណិត	Mental arithmetic helps estimate a grocery total.
308	algebra	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: algebra is the dictionary headword; compare its inflected or derived forms in context.	ពីជគណិត	Algebra can express the same pattern for any input.
309	statistic	noun Study Field: Grade 7 mathematics and data word Word study: Base-form focus: statistic is the dictionary headword; compare its inflected or derived forms in context.	ស្ថិតិ	The median is a statistic describing the center of a dataset.
310	mathematical	adjective Study Field: Grade 7 mathematics and data word Word study: Base-form focus: mathematical is the dictionary headword; compare its inflected or derived forms in context.	បែបគណិតសាស្ត្រ	The puzzle requires mathematical reasoning rather than guessing.
311	belief	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: belief is the dictionary headword; compare its inflected or derived forms in context.	ជំនឿ	Freedom of conscience protects each person's belief.
312	norm	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: norm is the dictionary headword; compare its inflected or derived forms in context.	ក្បួន គោលការណ៍ ច្បាប់ គ្រឹះ	Greeting visitors politely is a social norm in many communities.
313	institution	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	ស្ថាប័ន	A court is an institution that applies and interprets law.
314	religion	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: religion is the dictionary headword; compare its inflected or derived forms in context.	សាសនា	The constitution protects a person's right to practice a religion.
315	language	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: language is the dictionary headword; compare its inflected or derived forms in context.	ភាសា	Migration can bring a new language into a region.
316	art	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: art is the dictionary headword; compare its inflected or derived forms in context.	1. សិល្ប 2. សិល្បៈ	Public art can preserve community memory.
317	surplus	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: surplus is the dictionary headword; compare its inflected or derived forms in context.	អតិរេក	A food surplus allowed some workers to specialize in other trades.
318	specialization	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	ឯកទេស	Craft specialization increased as ancient cities grew.
319	artisan	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: artisan is the dictionary headword; compare its inflected or derived forms in context.	សិប្បករ	The artisan shaped clay into durable storage jars.
320	merchant	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: merchant is the dictionary headword; compare its inflected or derived forms in context.	1. អ្នកជំនួញ 2. ឈ្មួញ 3. តាយប៉ាន	The merchant carried spices between coastal ports.
321	barter	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: barter is the dictionary headword; compare its inflected or derived forms in context.	ដូរ	Through barter, a farmer traded grain for tools.
322	entrepreneurship	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: entrepreneurship is the dictionary headword; compare its inflected or derived forms in context.	ភាពជាសហគ្រិន	Her entrepreneurship turned a repair idea into a small company.
323	revenue	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: revenue is the dictionary headword; compare its inflected or derived forms in context.	1. ប្រាក់ចំណូល 2. ចំណូល	Ticket revenue pays for museum conservation.
324	debt	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: debt is the dictionary headword; compare its inflected or derived forms in context.	បំណុល	The city repaid its construction debt over twenty years.
325	credit	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: credit is the dictionary headword; compare its inflected or derived forms in context.	ឥណទាន	Responsible use of credit requires a plan for repayment.

Converting Measurements

Reading practice for pages 13–15. Five relevant words are highlighted.

English reading

A recipe uses customary cups, but the laboratory scale uses metric units. Imani applies a conversion formula and sees a repeating decimal on her calculator. She rounds only after checking how much precision the experiment requires.

Khmer translation

A reviewed translation is not available for this passage yet.

Reading comprehension

1. Which units does the recipe use?

The recipe uses customary units.

2. Which units does the scale use?

The scale uses metric units.

3. Why does Imani use a formula?

She uses it for unit conversion.

Page 14: words 326–350

Vocabulary page 14
#	Word	Details	Meaning	Sample sentence
326	interest	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: interest is the dictionary headword; compare its inflected or derived forms in context.	ការប្រាក់	The loan's interest increases its total cost.
327	recession	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -sion commonly forms a noun naming an action, process, or result.	ដំណើរធ្លាក់ចុះនៃសេដ្ឋកិច្ច	During the recession, many businesses reduced hiring.
328	unemployment	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	1. និកម្មភាព 2. អកម្មភាព	The factory closure caused unemployment to rise.
329	manufacturing	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: manufacturing is the dictionary headword; compare its inflected or derived forms in context.	ការផលិត	Automobile manufacturing supports many related industries.
330	investment	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	វិនិយោគ	The railway was a major public investment.
331	wealth	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: wealth is the dictionary headword; compare its inflected or derived forms in context.	1. វត្ថុ 2. ធន 3. ទ្រព្យសម្បត្តិ	Trade created wealth for the port but did not benefit every resident equally.
332	poverty	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: poverty is the dictionary headword; compare its inflected or derived forms in context.	ភាពក្រ	The relief program seeks to reduce childhood poverty.
333	public	adjective Study Field: Grade 7 history and civics word Word study: Base-form focus: public is the dictionary headword; compare its inflected or derived forms in context.	សាធារណៈ	The public library is supported by local taxes.
334	private	adjective Study Field: Grade 7 history and civics word Word study: Base-form focus: private is the dictionary headword; compare its inflected or derived forms in context.	ឯកជន	The farm is private property, although a public path crosses it.
335	monarchy	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: monarchy is the dictionary headword; compare its inflected or derived forms in context.	រាជាធិបតេយ្យ	The monarchy became largely ceremonial after constitutional reforms.
336	dictatorship	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: dictatorship is the dictionary headword; compare its inflected or derived forms in context.	អំណាចផ្ដាច់ការ	The dictatorship censored newspapers and arrested opponents.
337	oligarchy	noun Study Field: Grade 7 history and civics word Word study: Root and suffix focus: -archy relates to rule, rank, or a governing system.	អប្បាធិបតេយ្យ	Wealthy families dominated the ancient oligarchy.
338	theocracy	noun Study Field: Grade 7 history and civics word Word study: Root and suffix focus: -cracy relates to rule or a system of government.	ទេវាធិបតេយ្យ	In a theocracy, religious leadership also controls political authority.
339	judiciary	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: judiciary is the dictionary headword; compare its inflected or derived forms in context.	តុលាការ	An independent judiciary can limit abuses of power.
340	liberty	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: liberty is the dictionary headword; compare its inflected or derived forms in context.	សេរីភាព	The charter promises liberty of expression.
341	equality	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	ការស្មើ	The amendment advanced legal equality.
342	nationalism	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	ជាតិនិយម	Nationalism helped unite the region but also heightened rivalries.
343	patriotism	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	1. ការស្នេហាជាតិ 2. វីរភាព 3. ស្វទេសក្តី	Her patriotism included criticizing policies she believed were unjust.
344	protest	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: protest is the dictionary headword; compare its inflected or derived forms in context.	តវ៉ា	The peaceful protest called for safer working conditions.
345	strike	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: strike is the dictionary headword; compare its inflected or derived forms in context.	កូដកម្ម	The strike ended after employers agreed to negotiate.
346	suffrage	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: suffrage is the dictionary headword; compare its inflected or derived forms in context.	ការបោះឆ្នោត	Activists campaigned for universal suffrage.
347	party	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: party is the dictionary headword; compare its inflected or derived forms in context.	បក្សពួក	The new party focused its campaign on housing reform.
348	minority	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	ភាគតិច	The constitution protects minority rights against majority abuse.
349	representation	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	តំណាង	Residents demanded fair representation on the regional council.
350	district	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: district is the dictionary headword; compare its inflected or derived forms in context.	1. ស្រុក 2. ខណ្ឌ 3. ខេត្ត	Each district elects one council member.

Page 15: words 351–375

Vocabulary page 15
#	Word	Details	Meaning	Sample sentence
351	census	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: census is the dictionary headword; compare its inflected or derived forms in context.	ជំរឿន	The census records population changes every ten years.
352	ordinance	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state.	ដីកា	The city ordinance limits noise after midnight.
353	war	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: war is the dictionary headword; compare its inflected or derived forms in context.	1. ចំបាំង 2. សង្គ្រាម	The war displaced millions of civilians.
354	peace	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: peace is the dictionary headword; compare its inflected or derived forms in context.	1. សន្តិភាព 2. សន្តិកាល 3. សន្តិភាព មេត្រីភាព សេចក្ដីសុខសាន្ត	The treaty created a fragile peace.
355	truce	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: truce is the dictionary headword; compare its inflected or derived forms in context.	Truce	Both sides accepted a truce to evacuate the wounded.
356	armistice	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: armistice is the dictionary headword; compare its inflected or derived forms in context.	បទឈប់បាញ់	The armistice ended the fighting before a final treaty was signed.
357	migration	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	1. ការធ្វើចំណាកស្រុក 2. ចំណាកស្រុក 3. ទេសន្តរប្រវេសន៍	Seasonal jobs encouraged migration toward the coast.
358	immigration	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	អន្តោប្រវេសន៍	Immigration changed the city's languages, foods, and industries.
359	emigration	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ការធ្វើចំណាកស្រុក	Political persecution caused widespread emigration.
360	refugee	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: refugee is the dictionary headword; compare its inflected or derived forms in context.	ជនភៀសខ្លួន	The refugee applied for protection after crossing the border.
361	diaspora	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: diaspora is the dictionary headword; compare its inflected or derived forms in context.	ការបែកខ្ញែករបស់ជនជាតិយូដា	Letters connected members of the diaspora across several continents.
362	urban	adjective Study Field: Grade 7 history and civics word Word study: Base-form focus: urban is the dictionary headword; compare its inflected or derived forms in context.	ទីក្រុង	Urban planners proposed more parks near apartment buildings.
363	rural	adjective Study Field: Grade 7 history and civics word Word study: Base-form focus: rural is the dictionary headword; compare its inflected or derived forms in context.	ជនបទ	The rural clinic serves farms spread across a large county.
364	suburban	adjective Study Field: Grade 7 history and civics word Word study: Base-form focus: suburban is the dictionary headword; compare its inflected or derived forms in context.	ជាយក្រុង	A new rail line connected the suburban community to downtown.
365	geography	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: geography is the dictionary headword; compare its inflected or derived forms in context.	1. ភូមិសាស្ត្រ 2. ភូមវិទ្យា	Geography explains how rivers shaped the settlement pattern.
366	equator	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: equator is the dictionary headword; compare its inflected or derived forms in context.	1. ភូមធ្យរេខា 2. អេក្វាទ័រ	The equator passes through parts of South America, Africa, and Asia.
367	meridian	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: meridian is the dictionary headword; compare its inflected or derived forms in context.	Meridian	The prime meridian is assigned zero degrees longitude.
368	projection	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	ការបញ្ចាំង	Every map projection distorts some combination of area, shape, or distance.
369	elevation	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ការលើកឡើង	The mountain town has an elevation of two thousand meters.
370	assimilation	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	សមានកម្ម	Forced assimilation policies suppressed Indigenous languages.
371	acculturation	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	1. ការសម្របវប្បធម៌ 2. ការផ្លាស់ប្តូរវប្បធម៌ដោយការទាក់ទងគ្នា	Acculturation can involve exchange without complete loss of identity.
372	diversity	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	ភាពផ្សេងគ្នា	Linguistic diversity reflects the region's migration history.
373	ethnicity	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	1. ជាតិពន្ធុភាព 2. សភាពជាតិពន្ធុ	The census asks about ethnicity separately from citizenship.
374	gender	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: gender is the dictionary headword; compare its inflected or derived forms in context.	ភេទ	Ideas about gender roles vary across societies and time.
375	identity	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	1. អត្តសញ្ញាណ 2. អត្តសញ្ញាណ	Language became an important part of the community's identity.

Page 16: words 376–400

Vocabulary page 16
#	Word	Details	Meaning	Sample sentence
376	archaeology	noun Study Field: Grade 7 history and civics word Word study: Root and suffix focus: -logy means the study of a subject.	1. បុរាណវិទ្យា 2. បុរាណវត្ថុវិទ្យា	Archaeology revealed workshops beneath the modern marketplace.
377	chronology	noun Study Field: Grade 7 history and civics word Word study: Root and suffix focus: -logy means the study of a subject.	កាលប្បវត្តិវិទ្យា	The timeline establishes the chronology of the revolution.
378	era	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: era is the dictionary headword; compare its inflected or derived forms in context.	1. សម័យ 2. កាល 3. យុគ	The invention marked the beginning of a new era in communication.
379	decade	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: decade is the dictionary headword; compare its inflected or derived forms in context.	ទសវត្ស	The city's population doubled within one decade.
380	medieval	adjective Study Field: Grade 7 history and civics word Word study: Base-form focus: medieval is the dictionary headword; compare its inflected or derived forms in context.	មជ្ឈិមសម័យ	The medieval manuscript was copied by hand.
381	contemporary	adjective Study Field: Grade 7 history and civics word Word study: Base-form focus: contemporary is the dictionary headword; compare its inflected or derived forms in context.	សហសម័យ	Contemporary accounts describe how residents experienced the flood.
382	throne	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: throne is the dictionary headword; compare its inflected or derived forms in context.	បល្លង្ក	The prince renounced the throne and left the kingdom.
383	feudalism	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	សក្តិភូមិ	Under feudalism, land and service connected lords and vassals.
384	renaissance	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state.	ក្រុមហ៊ុន Renaissance	The Harlem Renaissance transformed American literature, music, and art.
385	reformation	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	កំណែទម្រង់	The Protestant Reformation divided western Christianity.
386	enlightenment	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	ការត្រាស់ដឹង	Enlightenment thinkers debated the source of government authority.
387	industrialization	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	ឧស្សាហូបនីយកម្ម	Industrialization drew workers into rapidly growing cities.
388	colonization	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	អាណានិគមកិច្ច	Colonization disrupted existing governments and trade networks.
389	abolition	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ition commonly forms a noun naming an action, process, or result.	ការលុបបំបាត់	The movement demanded the abolition of slavery.
390	emancipation	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ការអោយរួចជាអ្នកជា	The proclamation made emancipation a central aim of the war.
391	reconstruction	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	1. ការកកើត 2. ឡើងវិញ	Postwar reconstruction restored roads and created new institutions.
392	communism	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	1. កុម្មុយនិស្តនិយម 2. លទ្ធិកុម្មុយនិស្ត	Different governments interpreted communism in sharply different ways.
393	capitalism	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	1. មូលធននិយម 2. លទ្ធិមូលធននិយម	In capitalism, businesses usually compete to sell goods and services.
394	socialism	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	សង្គមនិយម	The party promoted democratic socialism through elections.
395	fascism	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	កលាបនិយម	Fascism gained power by exploiting fear and political violence.
396	totalitarianism	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	1. សមស្តនិយម 2. ផ្តាច់ការនិយម	The novel portrays totalitarianism through surveillance and forced loyalty.
397	censorship	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: censorship is the dictionary headword; compare its inflected or derived forms in context.	ការចាប់ពិរុទ្ធ	Government censorship prevented the newspaper from reporting the protest.
398	genocide	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: genocide is the dictionary headword; compare its inflected or derived forms in context.	ជនឃាត	The museum documents the genocide through survivor testimony.
399	discrimination	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ការរើសអើង	The law prohibits employment discrimination.
400	segregation	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	ការបែងចែក	Students challenged school segregation in court.

Building a Historical Chronology

Reading practice for pages 16–18. Five relevant words are highlighted.

English reading

Evidence from archaeology helps students build a chronology of the town. One coin comes from a medieval era, while a photograph belongs to a much later decade. Placing each object in time reveals how daily life changed.

Khmer translation

A reviewed translation is not available for this passage yet.

Reading comprehension

1. What helps students build the chronology?

Evidence from archaeology helps them.

2. Which object is medieval?

A coin is from the medieval era.

3. What does the timeline reveal?

It reveals changes in daily life.

Page 17: words 401–425

Vocabulary page 17
#	Word	Details	Meaning	Sample sentence
401	integration	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	សមាហរណកម្ម ការបញ្ជូលគ្នា	School integration faced organized resistance.
402	civil	adjective Study Field: Grade 7 history and civics word Word study: Base-form focus: civil is the dictionary headword; compare its inflected or derived forms in context.	ស៊ីវិល	The civil rights movement used courts, boycotts, and marches.
403	activism	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	សកម្មភាព	Youth activism helped expand access to public transportation.
404	charity	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	សេចក្តីស្រឡាញ់	The charity supplies meals during emergencies.
405	nonprofit	noun Study Field: Grade 7 history and civics word Word study: Prefix focus: non- means not or without.	មិនរកប្រាក់ចំណេញ	The nonprofit restored the historic theater.
406	transportation	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	1. ដំណឹកជញ្ជូន 2. ការដឹកជញ្ជូន	Reliable transportation connects workers with jobs.
407	sanitation	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	អនាម័យ	Modern sanitation reduced diseases spread by contaminated water.
408	education	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	1. ការសិក្សា 2. ការសិក្សាអប់រំ	Public education expanded during the nineteenth century.
409	housing	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: housing is the dictionary headword; compare its inflected or derived forms in context.	លំនៅដ្ឋាន	Rising rents created a shortage of affordable housing.
410	development	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	1. ការចេញពន្លក 2. ការលូតលាស់ 3. ដំណុះ	The council debated whether the development would damage the wetland.
411	globalization	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	សកលភាវូបនីយកម្ម	Globalization allows products to cross several borders before sale.
412	interdependence	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ence commonly forms a noun naming an action, quality, or state.	ភាពអាស្រ័យគ្នាទៅវិញទៅមក	Trade creates interdependence among producers, workers, and consumers.
413	media	noun Study Field: Grade 7 history and civics word Word study: Base-form focus: media is the dictionary headword; compare its inflected or derived forms in context.	មេឌៀ	Digital media can spread both verified reports and rumors rapidly.
414	journalism	noun Study Field: Grade 7 history and civics word Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	វិជ្ជាជីវៈខាងសារព័ត៌មាន	Responsible journalism separates confirmed facts from speculation.
415	agile	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: agile is the dictionary headword; compare its inflected or derived forms in context.	រហ័សរហួន	The agile goalkeeper changed direction in an instant.
416	trivial	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: trivial is the dictionary headword; compare its inflected or derived forms in context.	តូចតាច	A spelling preference is trivial compared with a factual error.
417	naive	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: naive is the dictionary headword; compare its inflected or derived forms in context.	ឆោតល្ងង់	It was naive to believe the advertisement without checking its claims.
418	wholehearted	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: wholehearted is the dictionary headword; compare its inflected or derived forms in context.	អស់ពីចិត្ត	The proposal received wholehearted support from the volunteers.
419	exotic	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: exotic is the dictionary headword; compare its inflected or derived forms in context.	កម្រនិងអសកម្ម	The greenhouse protects exotic plants from the winter cold.
420	neglected	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: neglected is the dictionary headword; compare its inflected or derived forms in context.	ធ្វេសប្រហែស	Volunteers repaired the neglected playground.
421	resigned	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: resigned is the dictionary headword; compare its inflected or derived forms in context.	លាលែងពីតំណែង	She sounded resigned after the final appeal was denied.
422	passive	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	អកម្ម	A passive observer watches the problem without helping to solve it.
423	drab	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: drab is the dictionary headword; compare its inflected or derived forms in context.	អូស	Bright murals transformed the drab concrete wall.
424	hardy	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: hardy is the dictionary headword; compare its inflected or derived forms in context.	រឹង	The hardy shrub survives cold winds and poor soil.
425	wily	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: wily is the dictionary headword; compare its inflected or derived forms in context.	វីលី	The wily fox circles downwind before approaching.

Page 18: words 426–450

Vocabulary page 18
#	Word	Details	Meaning	Sample sentence
426	illegible	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ible means capable of, suitable for, or able to be affected.	មិនស្របច្បាប់	Rain made the ink on the label illegible.
427	incompetent	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: incompetent is the dictionary headword; compare its inflected or derived forms in context.	អសមត្ថភាព	An incompetent repair could make the electrical fault more dangerous.
428	disoriented	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: disoriented is the dictionary headword; compare its inflected or derived forms in context.	វង្វេងស្មារតី	The hiker felt disoriented after fog covered the trail markers.
429	momentary	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: momentary is the dictionary headword; compare its inflected or derived forms in context.	សន្ទុះ	A momentary power loss reset the clock.
430	ominous	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ous commonly forms an adjective meaning full of or characterized by.	អាក្រក់	The sudden silence was an ominous sign of the approaching storm.
431	tranquil	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: tranquil is the dictionary headword; compare its inflected or derived forms in context.	ស្ងប់ស្ងាត់	At dawn, the lake looked tranquil and glassy.
432	exuberant	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: exuberant is the dictionary headword; compare its inflected or derived forms in context.	រំភើប	The exuberant dancers filled the stage with motion.
433	perilous	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ous commonly forms an adjective meaning full of or characterized by.	គ្រោះថ្នាក់	Icy ledges made the ascent perilous.
434	ravenous	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ous commonly forms an adjective meaning full of or characterized by.	Ravenous	After the long hike, everyone was ravenous.
435	desolate	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: desolate is the dictionary headword; compare its inflected or derived forms in context.	ស្ងាត់ជ្រងំ	Abandoned houses made the mining town seem desolate.
436	nimble	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: nimble is the dictionary headword; compare its inflected or derived forms in context.	រហ័សរហួន	Her nimble fingers repaired the tiny clockwork mechanism.
437	defiant	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: defiant is the dictionary headword; compare its inflected or derived forms in context.	តស៊ូ	The defiant witness refused to repeat the false statement.
438	intimidated	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: intimidated is the dictionary headword; compare its inflected or derived forms in context.	បំភិតបំភ័យ	The new speaker felt intimidated by the enormous audience.
439	grave	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: grave is the dictionary headword; compare its inflected or derived forms in context.	ផ្នូរ	The doctor warned that the infection posed a grave danger.
440	docile	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: docile is the dictionary headword; compare its inflected or derived forms in context.	Docile	The usually wild horse became docile around its trusted handler.
441	despicable	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	គួរឱ្យស្អប់ខ្ពើម	Stealing emergency supplies was a despicable act.
442	lamentable	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	សោកសៅ	The archive's poor storage was a lamentable failure of planning.
443	lofty	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: lofty is the dictionary headword; compare its inflected or derived forms in context.	ខ្ពង់ខ្ពស់	The organization set a lofty goal of ending local homelessness.
444	distinctive	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	1. ដោយឡែក 2. ផ្សេង	The bird's distinctive call begins with three short notes.
445	shrewd	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: shrewd is the dictionary headword; compare its inflected or derived forms in context.	ឆ្លាត	The shrewd negotiator recognized which terms mattered most.
446	prosperous	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ous commonly forms an adjective meaning full of or characterized by.	1. រុងរឿង 2. រីកចម្រើន 3. វិបុលភាព	The prosperous port attracted merchants from distant regions.
447	unsightly	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: unsightly is the dictionary headword; compare its inflected or derived forms in context.	មិនល្អ	The builders concealed the unsightly pipes behind a panel.
448	offensive	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	វាយលុក	The editor removed an offensive stereotype from the advertisement.
449	raucous	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ous commonly forms an adjective meaning full of or characterized by.	រ៉ាខូស	A raucous cheer erupted after the final goal.
450	dejected	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: dejected is the dictionary headword; compare its inflected or derived forms in context.	ច្រានចោល	The dejected team congratulated its opponents despite the loss.

Page 19: words 451–475

Vocabulary page 19
#	Word	Details	Meaning	Sample sentence
451	symmetrical	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: symmetrical is the dictionary headword; compare its inflected or derived forms in context.	ត្រឹម	The butterfly's wings form a nearly symmetrical pattern.
452	potent	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: potent is the dictionary headword; compare its inflected or derived forms in context.	ខ្លាំង	The concentrated cleaner is potent enough to damage paint.
453	uncanny	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: uncanny is the dictionary headword; compare its inflected or derived forms in context.	មិនធម្មតា	The twins had an uncanny ability to finish each other's sentences.
454	enticing	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: enticing is the dictionary headword; compare its inflected or derived forms in context.	ទាក់ទាញ	The bakery's warm aroma was enticing.
455	rash	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: rash is the dictionary headword; compare its inflected or derived forms in context.	កន្ទួល	Crossing the flooded bridge would be a rash decision.
456	hostile	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: hostile is the dictionary headword; compare its inflected or derived forms in context.	អរិភាព	Few plants can survive the crater's hostile conditions.
457	tactful	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: tactful is the dictionary headword; compare its inflected or derived forms in context.	ជាមនុស្សវាងវែ	Her tactful correction focused on the error rather than the writer.
458	abrupt	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: abrupt is the dictionary headword; compare its inflected or derived forms in context.	ភូមិវិទ្យា) ចំណោតខ្លាំង	The road ends at an abrupt drop near the cliff.
459	sober	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: sober is the dictionary headword; compare its inflected or derived forms in context.	ស្ងប់ស្ងាត់	The report offers a sober assessment of the recovery costs.
460	cheerful	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: cheerful is the dictionary headword; compare its inflected or derived forms in context.	រីករាយ	His cheerful greeting eased everyone's nervousness.
461	skeptical	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: skeptical is the dictionary headword; compare its inflected or derived forms in context.	សង្ស័យ	The skeptical reviewer asked to see the original data.
462	doubtful	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: doubtful is the dictionary headword; compare its inflected or derived forms in context.	1. សង្ស័យ 2. Doubtful	It is doubtful that the damaged bridge can reopen today.
463	vain	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: vain is the dictionary headword; compare its inflected or derived forms in context.	ឥតប្រយោជន៍	The vain ruler ordered statues of himself in every square.
464	proud	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: proud is the dictionary headword; compare its inflected or derived forms in context.	មោទនភាព	The volunteers felt proud of the garden they had restored.
465	ashamed	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: ashamed is the dictionary headword; compare its inflected or derived forms in context.	អៀនខ្មាស់	He felt ashamed after admitting that he had lied.
466	remorseful	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: remorseful is the dictionary headword; compare its inflected or derived forms in context.	វិប្បដិសារី	The remorseful driver paid for the damaged fence.
467	resentful	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: resentful is the dictionary headword; compare its inflected or derived forms in context.	អន់ចិត្ត	Workers became resentful when only managers received credit.
468	sympathetic	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: sympathetic is the dictionary headword; compare its inflected or derived forms in context.	ស្គាល់ពីអារម្មណ៏របស់គេ	The counselor was sympathetic but still explained the rule.
469	empathetic	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: empathetic is the dictionary headword; compare its inflected or derived forms in context.	យល់ចិត្ត	An empathetic response acknowledges why the loss hurts.
470	apathetic	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: apathetic is the dictionary headword; compare its inflected or derived forms in context.	ស្ពឹកស្រពន់	Voters remained apathetic because none of the candidates addressed housing.
471	patient	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: patient is the dictionary headword; compare its inflected or derived forms in context.	1. អ្នកជំងឺ 2. អ្នកឈឺ	A patient instructor explained the process again.
472	tolerant	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: tolerant is the dictionary headword; compare its inflected or derived forms in context.	អត់ឱន	A tolerant community protects peaceful disagreement.
473	obedient	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: obedient is the dictionary headword; compare its inflected or derived forms in context.	ស្ដាប់បង្គាប់	The obedient dog waited beside the open gate.
474	rebellious	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ous commonly forms an adjective meaning full of or characterized by.	បះបោរ	The rebellious artist rejected the academy's strict conventions.
475	reckless	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: reckless is the dictionary headword; compare its inflected or derived forms in context.	ដែលមិនប្រយ័ត្ន	Reckless driving endangered everyone near the crossing.

An Uncanny Garden

Reading practice for pages 19–20. Five relevant words are highlighted.

English reading

The garden’s perfectly symmetrical paths look almost uncanny at dusk. An enticing scent comes from white flowers, but their sap contains a potent irritant. Visitors should not make a rash decision to touch an unfamiliar plant.

Khmer translation

A reviewed translation is not available for this passage yet.

Reading comprehension

1. Why do the paths look uncanny?

They are perfectly symmetrical at dusk.

2. What is enticing?

The flowers' scent is enticing.

3. Why should visitors avoid a rash choice?

The sap contains a potent irritant.

Page 20: words 476–500

Vocabulary page 20
#	Word	Details	Meaning	Sample sentence
476	timid	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: timid is the dictionary headword; compare its inflected or derived forms in context.	1. ត្រុកៗ 2. អៀន 3. ទុយមុយ	The timid kitten hid behind the chair.
477	valiant	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: valiant is the dictionary headword; compare its inflected or derived forms in context.	ក្លាហាន	The valiant rescue crew entered the flooded tunnel.
478	persistent	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: persistent is the dictionary headword; compare its inflected or derived forms in context.	មិនព្រម	Her persistent questions uncovered the accounting error.
479	idle	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: idle is the dictionary headword; compare its inflected or derived forms in context.	ទំនេរ	The idle factory machinery gathered dust.
480	imaginative	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	ការស្រមើស្រមៃ	The imaginative solution reused rainwater to cool the roof.
481	practical	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: practical is the dictionary headword; compare its inflected or derived forms in context.	ជាក់ស្តែង	The committee chose a practical repair it could afford.
482	logical	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: logical is the dictionary headword; compare its inflected or derived forms in context.	1. សម 2. ឡូជីខល	The final conclusion is logical because each step follows from evidence.
483	sensible	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ible means capable of, suitable for, or able to be affected.	សតិអារម្មណ៍	Bringing extra water was a sensible precaution.
484	probable	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	ប្រហែល	Heavy clouds make rain probable this afternoon.
485	unlikely	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: unlikely is the dictionary headword; compare its inflected or derived forms in context.	មិនទំនង	It is unlikely that the small pond caused the regional flood.
486	optional	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: optional is the dictionary headword; compare its inflected or derived forms in context.	ស្រេចចិត្ត	The extra research question is optional.
487	voluntary	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: voluntary is the dictionary headword; compare its inflected or derived forms in context.	ស្ម័គ្រចិត្ត	Participation in the anonymous survey is voluntary.
488	mandatory	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: mandatory is the dictionary headword; compare its inflected or derived forms in context.	ចាំបាច់	Safety goggles are mandatory in the laboratory.
489	temporary	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: temporary is the dictionary headword; compare its inflected or derived forms in context.	បណ្ដោះអាសន្ន	A temporary bridge will carry pedestrians during repairs.
490	unstable	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	គ្មានលំនឹង	The cracked slope became unstable after heavy rain.
491	uniform	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: uniform is the dictionary headword; compare its inflected or derived forms in context.	ឯកសណ្ឋាន	The machine applies a uniform layer of paint.
492	subtle	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: subtle is the dictionary headword; compare its inflected or derived forms in context.	ស្រទន់	A subtle shift in tone makes the apology sound insincere.
493	obvious	adjective Study Field: Grade 7 precise high-utility word Word study: Suffix focus: -ous commonly forms an adjective meaning full of or characterized by.	ជាក់ស្តែង	The missing wheel was the most obvious problem.
494	audible	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: audible is the dictionary headword; compare its inflected or derived forms in context.	អាចស្តាប់បាន។	The speaker's final words were barely audible.
495	concrete	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: concrete is the dictionary headword; compare its inflected or derived forms in context.	បេតុង	The proposal needs concrete steps, not general promises.
496	durable	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: durable is the dictionary headword; compare its inflected or derived forms in context.	ជាប់លាប់	The durable fabric survived years of outdoor use.
497	rigid	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: rigid is the dictionary headword; compare its inflected or derived forms in context.	រឹង	A rigid frame keeps the telescope steady.
498	elastic	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: elastic is the dictionary headword; compare its inflected or derived forms in context.	ជ័រ	The elastic cord lengthened under the load.
499	rough	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: rough is the dictionary headword; compare its inflected or derived forms in context.	គគ្រើម	The rough stone can scratch polished wood.
500	coarse	adjective Study Field: Grade 7 precise high-utility word Word study: Base-form focus: coarse is the dictionary headword; compare its inflected or derived forms in context.	គ្រើម	The filter catches coarse sand before the water reaches the fine mesh.

Sources and curriculum references

These references guide selection and calibration. Definitions, sample sentences, readings, questions, and teaching notes are independently written and reviewed.