Câu hỏi: I promptly went to sleep again. 

A. early

B. immediately 

C. soon 

D. after a while

Câu 1: The police questioned all guests. They……………….that one of them was a spy.

A. wondered 

B. surprised 

C. challenged

D. suspected

Câu 2: Einstein's …….is really too difficult for the average people to understand. 

A. explanation

B. knowledge

C. experiment

D. theory

Câu 3: Because of the increasing enrolment, the school has to employ teachers who are not…….for their jobs. 

A. qualifying

B. qualified 

C. worth 

D. skilled

Câu 4: It ________ easy to paint pictures if you knew how to.

A. would be

B. had been

C. would have been

D. be

Câu 5: We don't sell foreign newspapers because there is no……….for them.

A. request

B. claim

C. suggest

D. ask

Câu 6: The rivers can be…………..by chemicals. 

A. poisonous 

B. contaminated

C. flooded

D. polluting