Câu hỏi: By measuring the color of a star, astronomers can tell how hot is it.

A. measuring

B. the

C. how

D. is it

Câu 1: Unlike the old one, this new copier can perform their functions in half the time.

A. unlike

B. can perform

C. their functions

D. in half the time

Câu 2: It is time the government do something to help the unemployed to find some jobs.

A. do

B. time

C. the unemployed

D. some

Câu 3: The governor, with his wife and children, are at home watching the election results on TV.

A. his

B. are

C. watching 

D. on TV

Câu 4: An ambitious person is committed to improve his or her status at work.

A. is

B. improve

C. status

D. at

Câu 5: 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 6: John announced that he could not longer tolerate the conditions of the contract under which he was working.

A. announced that

B. not longer tolerate

C. of

D. under which