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

A. uninterested 

B. unsure

C. open

D. slow

Câu 1: She was always very hard-working at school.

A. studious

B. learned

C. lazy

D. attentive

Câu 2: Certain courses are compulsory; others are optional.

A. voluntary

B. free

C. pressure

D. mandatory

Câu 3: The earth is being threatened and the future looks bad.

A. done

B. made

C. protected

D. varied

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: She must be very strong to carry such a weight on her back.

A. weak

B. musculous

C. sick

D. healthy

Câu 6: 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