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

A. done

B. made

C. protected

D. varied

Câu 2: 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 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: You can find the answer to almost any question in cyberspace.

A. require

B. comment

C. answer

D. sentence

Câu 5: Using Facebook, you can post update sayings about your life every day.

A. locate

B. displace

C. establish

D. put up

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

A. slow

B. open

C. unsure

D. uninterested