Câu hỏi: 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 1: When we were children we          skating. 

A. had gone

B. were going 

C. go 

D. used to go

Câu 2: Constantly staying in cold weather may bring           pneumonia

A. in

B. off

C. up

D. on

Câu 3: We decided to go out for dinner _________it was raining heavily. 

A. because

B. despite 

C. even if

D. although

Câu 4:              Christmas Eve, people often have parties at midnight

A. In

B. At

C. On

D. For

Câu 5: “I would study English if I were you,” Mai’s friend said. 

A. Mai’s friend advised her to study English.

B. Mai’s friend advised her to have studied English.

C. Mai’s friend said that she was like Mai.

D. Mai told her friend to study English.

Câu 6: 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.