Câu hỏi: The earth is being threatened and the future looks bad.

A. done

B. made

C. protected

D. varied

Câu 1: Certain courses are compulsory; others are optional.

A. voluntary

B. free

C. pressure

D. mandatory

Câu 2: It must be difficult to cope with three small children and a job.

A. easy

B. free

C. confusing

D. tricky

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: 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 5: His policies were beneficial to the economy as a whole.

A. harmless

B. crude

C. harmful

D. good

Câu 6: You did a beautiful thing in helping those poor children.

A. meaningful

B. good

C. terrible

D. positive