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

A. fluctuate

B. stay unchanged

C. restrain

D. remain unstable

Câu 1: Mr. Smith’s new neighbors appear to be very friendly.

A. amicable

B. inapplicable

C. hostile

D. futile

Câu 2: When the bank refused to lend us any more money we realized we'd reached the end of the road.

A. give

B. hold

C. take

D. borrow

Câu 3: Soon after it was born, the calf got up and tried to stand on its shaky legs.

A. appeared

B. died

C. joined

D. celebrated

Câu 4: Certain courses are compulsory; others are optional.

A. voluntary

B. free

C. pressure

D. mandatory

Câu 5: They started building the house in January.

A. begin

B. finish

C. commence

D. continue

Câu 6: The whole conference was totally disorganized - nobody knew what they were supposed to be doing.

A. someone

B. nothing

C. no one

D. something