Câu hỏi: The police had to let her _________ because of insufficient evidence. 

A. go

B. to go 

C. going 

D. gone

Câu 1: When we were children we          skating. 

A. had gone

B. were going 

C. go 

D. used to go

Câu 2: I have two history books, but ____are about American history

A. none of them

B. all of them

C. neither of them

D. most of them 

Câu 3: People have discovered a new source of energy. 

A. A new source of energy have been discovered by people.

B. A new source of energy has discovered.

C. A new source of energy has been discovered.

D. A new source of energy have been discovered. 

Câu 4: We must take steps to preserve natural resources; otherwise the planet will be in danger. 

A. Unless we take steps to preserve natural resources, the planet will be in danger. 

B. Unless we take steps to preserve natural resources,the planet will not be in danger.

C. If we take steps to preserve natural resources, the planet would be in danger.

D. If we take steps to preserve natural resources,the planet will be in danger. 

Câu 5: We didn’t go on holiday last year because we didn’t have enough money.

A. If we hadn’t had enough money, we wouldn’t have gone on holiday last year.

B. If we had had enough money, we would have gone on holiday last year. 

C. If we hadn’t had enough money, we would have gone on holiday last year. 

D. Unless we had enough money, we would go on holiday last year

Câu 6:                 his childhood in DALAT, he knew the city well

A. To spend 

B. Spent

C. Having spent 

D. To have spent