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: What the woman was saying were so important that I asked everyone to stop talking and listen.

A. What

B. was saying

C. were

D. to stop taking

Câu 2: 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 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: People say that Cameron was the best director of his time.

A. Cameron is said to be best director of his time.

B. Cameron was said to have been the best director of his time.

C. It was said that Cameron was the best director of his time. 

D. Cameron is said to have been the best director of his time.

Câu 5: The novel was such interesting that I read it from the beginning to the end in 4 hours.

A. such

B. read

C. the beginning

D. in

Câu 6: 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