5.　　　 In the old days cars couldn’t ____________in China.

4.　　　 When their car becomes old, they _________ buy a new one rather than repair it.

3.　　　 He __________ in the factory for ten years by the end of last year.

2.　　　 When were you __________?

　(work　　 prefer to　 go　 pay for　 bear　 build　 make)　

1.　　　 David isn’t here. He _______ to the reading room.

5.I’m afraid I can’t a________ with you.

4.Our k____________of the universe is growing all the time.

3.The population problem is the greatest c__________of the world today.

2.India is one of the d__________countries in the world.

1.The population of that country is over two b_________.