11.The fruit fresh in his fruit stand sells well.

A.looking B.looked C.look D.to be looked

解析：look为连系动词

12.—Really ? Who will give lecture ? What is it about ?

—Professor Chen , president of Beijing University . About pollution .

A.the ;a B.the;/ C.a ; the D.a ;/

解析：president 作同位语，前不加冠词。

13.There is a new problem in the popularity of private cars road conditions need to be improved .

A.involving ; that B.involved ; that

C.involved; where D.involving ; which

解析：be involved in ,that引导的同位语从句。

14. that there is no opposition , I will report it to the general manager .

A.To provide B.Be provided C.Having provided D.Providing

解析：provided that, providing that假如

15.Professor Smith has written some short stories , but he is known for his plays .

A.better ycy B.more C.best D.most

解析：be well known

16. in faraway northwest , this place has its beautiful fresh air .

A.Being located B.Located C.locating D.To be located

解析：be located in

17.Some friends tried to settle the quarrel between Mr. and Mrs. Brown without hurting the feeling of , but failed .

A.none B.either C.both D.neither

解析：either指两者中的任何一个

18.It’s not books you read but the way you read them that decides how successfully you gain knowledge .

A.a number of ; in which B.the number of ; /

C.a good many ; which D.quite a few ; in which

解析：强调句型，不是你读的数量而是你读的方式

19.Bird flu , a contagious disease of animals , is believed by viruses that normally infect only birds and less commonly pigs , and rarely humans .

A.caused B.being caused C.to be caused D.to have caused

20.The police got to was once an old school the peasants used as a store .

A.what , that YCY B.where , which C.where , that D.which , where

解析：what 等于 the place that 后为 that引导的定语从句。