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

A. poisonous 

B. contaminated

C. flooded

D. polluting

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: I need some small change to……..the porter. 

A. dip

B. chip

C. sip

D. tip

Câu 3: I talked to _______ grandmother for three hours last night.

A. he

B. him

C. his

D. himself

Câu 4: Can you see the man ______ is sitting at that table?

A. whose

B. who

C. whom

D. which

Câu 5: I promptly went to sleep again. 

A. early

B. immediately 

C. soon 

D. after a while

Câu 6: The elevator isn't running now. It must be….order. 

A. out of

B. for

C. into 

D. behind