Câu hỏi: 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 1: 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 2: The earth is being threatened and the future looks bad.

A. done

B. made

C. protected

D. varied

Câu 3: The whole conference was totally disorganized - nobody knew what they were supposed to be doing.

A. someone

B. nothing

C. no one

D. something

Câu 4: We ought to keep these proposals secret from the chairman for the time being.

A. lively

B. frequented

C. accessible

D. revealed

Câu 5: They started building the house in January.

A. begin

B. finish

C. commence

D. continue

Câu 6: She was always very hard-working at school.

A. studious

B. learned

C. lazy

D. attentive