Câu hỏi: ……….., he would have been able to pass the exam. 

A. If he studied hard

B. If studying hard

C. If he were studying hard

D. Had he studied hard

Câu 1: "How do you know this is the right plane?" - "The ticket agent said it would be at……….."

A. gate six

B. six gates 

C. sixth gate

D. the gate six

Câu 2: The chief of police………work is very important takes care of the public safety. 

A. who

B. which

C. whose

D. whom

Câu 3: I have had a headache…………….yesterday.

A. till

B. for

C. since

D. until

Câu 4: The students were all………….by the lion's roar. 

A. frighented

B. destroyed

C. bitten

D. collapsed

Câu 5: Nothing will prevent him……..succeeding. 

A. in

B. at

C. from

D. on

Câu 6: The board of directors proposed that an outside consultant ……………..in. 

A. be brought

B. will be brought

C. will bring

D. will be bringing