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

A. voluntary

B. free

C. pressure

D. mandatory

Câu 1: She must be very strong to carry such a weight on her back.

A. weak

B. musculous

C. sick

D. healthy

Câu 2: 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 3: I’d like to pay some money into my bank account.

A. withdraw some money from

B. put some money into

C. give some money out

D. leave some money aside

Câu 4: I've put the cake on a high shelf where he can't get at it.

A. low

B. untouchable

C. far

D. difficult to reach

Câu 5: You did a beautiful thing in helping those poor children.

A. meaningful

B. good

C. terrible

D. positive

Câu 6: We offer a speedy and secure service of transferring money in less than 24 hours.

A. uninterested 

B. unsure

C. open

D. slow