Câu hỏi: 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 1: The only means of access to the station is through a dark subway.

A. arrival

B. admission

C. outlet

D. output

Câu 2: He is over the moon about his examination result.

A. stressed

B. very sad

C. very happy

D. satisfied

Câu 3: He is among wealthy members of the golf club.

A. adroit

B. affluent

C. adjacent

D. poor

Câu 4: Solar energy is not only plentiful but also infinite.

A. without limit

B. boundless

C. limited

D. indefinite

Câu 5: His replies were inconsistent with his previous testimony.

A. contradicted

B. compatible

C. enhanced

D. incorporated

Câu 6: A chronic lack of sleep may make us irritable and reduces our motivation to work.

A. uncomfortable

B. responsive

C. calm

D. miserable