4. The man we followed suddenly stopped and looked as if ______ whether he was going in the right direction.

A. seeing　　　 B. having seen　　　　 C. to have seen　　　 D. to see

3. The manager, ______ his factory’s products were poor in quality, decided to give his workers further training.

A. knowing　　　 B. known　　　 C. to know　　　　 D. being known

2. - Why did you go back to the shop ?

- I left my friend ______ there.

A. waiting　　　 B. to wait　　　　 C. wait　　　　　 D. waits

1. prices of daily goods ________ through a computer can be lower than store prices.

A. are bought　　　 B. bought　　　　 C. been bought　　　 D. buying

15. Having a trip abroad is certainly for the old couple, but it remains ______ whether they will enjoy it.

A. to see　　　 B. to be seen　　　　 C. seeing　　　 D. seen

　(二)

14. The research is so designed that once ______ nothing can be cone to change it.

A. begins　　　 　B. having begun　　　 C. beginning　　　　 D. begun

13. With a lot of difficult problems ______, the newly –elected president is having a hard time.

A. settled　　　　　 B. settling　　　　 C. to settle　　　　 D. being settled

12. When _____, the museum will be open to the public next year.

A. completed　　　　 B. completing　　　 C. being completed　　 D. to be completed

11. In some parts of London, missing a bus means _______ for another hour.

A. waiting　　　　 B. to wait　　　　 C. wait　　　　 D. to be waiting

10. In order to gain a bigger share in the international market, many state –run companies are striving _______ their products more competitive.

A. to make　　　 B. making　　　 C. to have made　　　 D. having made