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: Her thoughtless comments made him very angry.

A. honest

B. kind

C. pleasant

D. thoughtful

Câu 2: My cousin tends to look on the bright side in any circumstance.

A. be optimistic

B. be pessimistic

C. be confident

D. be smart

Câu 3: The distinction between schooling and education implied by this remark is important.

A. explicit

B. implicit

C. obscure

D. odd

Câu 4: There has been no discernible improvement in the noise levels since lorries were banned.

A. insignificant

B. clear

C. obvious

D. thin

Câu 5: 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 6: Solar energy is not only plentiful but also infinite.

A. without limit

B. boundless

C. limited

D. indefinite