______can cause problems such as transport congestion, lack of sufficient housing, over-rapid growth and environmental degradation.

A. had already the film seen

B. had already seen the film

C. the film had already seen

D. had seen already the film

A. But for the driver, we would have survived that accident.

B. If we weren’t driving carefully, the driver couldn’t have survived that accident.

C. Had the driver not been driving carefully, we wouldn’t have survived that accident.

D. Without our seat belts, we could have survived that accident.

A. have been

B. was

C. were

D. had been

A. research into sound reproduction.

B. development of sound with movies.

C. disadvantages of synchronized sound.

D. history of silent movies.

A. are

B. were

C. have been

D. is

A. would have tried

B. would try

C. will not try

D. wouldn't have tried

A. tries

B. receives

C. teaches