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: She went to live in another state after the break-up of her marriage.

A. loneliness

B. anniversary

C. celebrity

D. divorce

Câu 2: The earth is being threatened and the future looks bad.

A. done

B. made

C. protected

D. varied

Câu 3: Using Facebook, you can post update sayings about your life every day.

A. locate

B. displace

C. establish

D. put up

Câu 4: I have a modest little glass fish tank where I keep a variety of small fish.

A. moderate

B. limited

C. narrow

D. large

Câu 5: Barry seems happy enough working for himself.

A. funny

B. satisfied

C. upset

D. interested

Câu 6: Certain courses are compulsory; others are optional.

A. voluntary

B. free

C. pressure

D. mandatory