Câu hỏi: An endangered species is the one _________ population is so small that it is in danger of becoming extinct.

A. which

B. what

C. whose

D. who

Câu 1: Ms. Brown asked me _________ in my class.

A. how many students there were

B. were there how many students

C. how many students were there

D. there were how many students

Câu 2: I’d rather _________ to the party with my parents because there was nothing interesting there.

A. hadn’t been invited

B. not have been invited

C. haven’t been invited

D. not be invited

Câu 3: Sleeping, resting, and to drink fruit juice are the best ways to cure for a cold.

A. Sleeping

B. to drink

C. juice

D. best ways

Câu 4: Some snakes have hollow teeth they are called fans that they use to poison their victims.

A. Some 

B. they are called

C. use

D. their

Câu 5: _________, we would have been forced to sack him.

A. Were he not to resign

B. If he resigned

C. Had he not resigned

D. If he had resigned

Câu 6: Sports clear my mind. They also help me maintain a healthy lifestyle.

A. Not only do sports clear my mind, but they also help me maintain a healthy lifestyle.

B. Neither do sports clear my mind nor help me maintain a healthy lifestyle.

C. Sports clear my mind so that I can maintain a healthy lifestyle.

D. All that sports can do is to clear my mind instead of maintaining a healthy lifestyle.