Câu hỏi: 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 1: 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 2: The news surprised everyone in the family. 

A. Everyone in the family found the news surprising.

B. The news in the family made everyone surprisingly.

C. The news made everyone surprised in the family.

D. Everyone was surprised by the news in the family.

Câu 3: The result of the studies have had a strong impact on future developments.

A. of

B. have had

C. strong

D. on

Câu 4: George is not enough intelligent to pass this economics class without help.

A. enough intelligent

B. to pass

C. economics

D. help

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: 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