Câu hỏi: Scientists say forests are being destroyed by air pollution. 

A. Scientists are blamed for destroying forests.

B. Scientists blame air pollution for the destruction of forests.

C. Forests are said to destroy air pollution.

D. According to scientists, there's much air pollution in the forests. 

Câu 1: ............., he wouldn’t have missed the train

A. If he listened to me

B. Unless she had listened to me

C. If he had listened to me

D. If he didn’t listen

Câu 2: Alex did not do very well in class............ 

A. therefore he was a good student

B. because he failed to study properly

C. although he was not hard-working

D. as long as he had studied badly

Câu 3: Sue has been our next-door neighbour for years, .........

A. and we hardly ever see her

B. therefore, she never sees us 

C. so we hardly ever see her

D. however, we hardly ever see her

Câu 4: In bacteria and other organisms, ............

A. it is the DNA that provides the genetic information

B. which is the DNA that provides the genes

C. the DNA providing the genetic information

D. the DNA that provides the genetic information 

Câu 5: here isn't much call for cars with large engines any more. 

A. No longer are cars bought by telephoning.

B. Not many people want to buy cars with large engines any more.

C. More and more people want to buy cars with large engines.

D. People didn't use to buy cars with large engines. 

Câu 6: He won't find a seat unless he's got a ticket. 

A. Because he has got a ticket already, he will find a seat. 

B. He can't find a seat although he has a ticket.

C. He will only get a seat if he has a ticket.

D. He will be able to get a ticket when he finds a seat.