305.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

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

----I left my friend ___there.

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

302.Prices of daily goods___ through a computer can be lower than store prices.

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

[　 ]303 -----How do you deal with the disagreement between the company and the customers?

-----The key ___the problem is to meet the demand ___by the customers.

A. to solving; making　　　　 B. to solving; made　　　　

C. to solve; making　　　　　 D. to slove; made　　　

301.The research is so designed that once ___nothing can be done to change it.

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

300.Having a trip abroad is certainly good for the old couple, but it remains ___whether they will enjoy it.

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

299.As we joined the big crowd I got ___from my friends.

　 A. separated　 B. spared　 C. lost　 D. missed　　　

298._______such heavy pollution already, it may now be too late to clean up the river.

　 A. Having suffered　 B. Suffering　 C. To suffer　 D. Suffered

297. “How did Bob do in the exam this time?” “Well, his father seems ___with his results”.

A. pleasing　 B. please　 C. pleased　 D. to please　　　　　　　　

296. Ten years ago, there was an old man ____in the house.　

　　 A. lived　 B. living　 C live　 D. was living　　　　　　　　 　　　　

295..Mother ___us stories when we were young.　

A. was used to tell　 B. is used to telling C. used to tell　 D. used to telling