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

A. voluntary

B. free

C. pressure

D. mandatory

Câu 1: You did a beautiful thing in helping those poor children.

A. meaningful

B. good

C. terrible

D. positive

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

A. uninterested 

B. unsure

C. open

D. slow

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: The Red Cross is an international humanitarian agency dedicated to reducing the sufferings of wounded soldiers, civilians and prisoners of war.

A. worry and sadness

B. pain and sorrow

C. loss

D. happiness

Câu 6: Using Facebook, you can post update sayings about your life every day.

A. locate

B. displace

C. establish

D. put up