Câu hỏi: Little have people done to alleviate the sea pollution caused by the factories in central Vietnam, haven’t they?

A. have people done

B. caused

C. in central

D. haven’t they

Câu 1: Passengers are required to arrive to the gate fifteen minutes before departure time.

A. are required

B. to arrive to

C. before

D. departure time

Câu 2: An ambitious person is committed to improve his or her status at work.

A. is

B. improve

C. status

D. at

Câu 3: I clearly remember to tell you about this before.

A. clearly

B. remember

C. to tell 

D. about

Câu 4: The bus was plenty of people who had spent many a happy hour shopping at the new.

A. plenty of

B. who

C. many a happy hour

D. shopping

Câu 5: She only had a twenty-dollars bill with her when she landed at Healthrow airport.

A. had

B. twenty-dollars bill

C. when

D. at

Câu 6: For thousands of years, man has created sweet-smelling substances from wood, herbs and flowers and using them for perfumes or medicine.

A. man

B. sweet-smelling

C. using them

D. or