Câu hỏi: We are very grateful to Professor Humble for his generosity in donating this wonderful painting to the museum.

A. meanness

B. sympathy

C. gratitude

D. churlishness

Câu 1: My mom is always bad-tempered when I leave my room untidy.

A. feeling embarrassed

B. talking too much

C. very happy

D. easily annoyed

Câu 2: The distinction between schooling and education implied by this remark is important.

A. explicit

B. implicit

C. obscure

D. odd

Câu 3: Population growth rates vary among regions and even among countries within the same region.

A. restrain

B. stay unchanged

C. remain unstable

D. fluctuate

Câu 4: A chronic lack of sleep may make us irritable and reduces our motivation to work.

A. uncomfortable

B. responsive

C. calm

D. miserable

Câu 5: The only means of access to the station is through a dark subway.

A. arrival

B. admission

C. outlet

D. output

Câu 6: Solar energy is not only plentiful but also infinite.

A. without limit

B. boundless

C. limited

D. indefinite