題目：

11.? It ____I who _____leaving for London.

??? B. am…is??? C. is…am??? D. am…am

12.? Not only Tom but also his wife ____fond of watching television.
??? A. are???? B. were??? C. be??? D. is

13.? When and where to build the new factory ____yet.
??? A. is not decided??????????????? B. are not decided
??? C. has not decided????????????? D. have not decided

14.? Although the first part of the book is easy， the rest ______.
??? A. are difficult???????????????????B. has proved difficult
????C. is supposed difficult????????D. have been found difficult

?15.? That they were wrong in these matters _____ now clear to us all.
??? A. is??? B. was??? C. are??? D. were

16.? Half of his goods ____ stolen the other day.
??? A. are??? B. were??? C. is??? D. was

?17.? Mathematics ____the language of science.
??? A. are??????? B. are going to be?????? C. is???????????? D. is to be

18.? Each of the students _____ a Chinese-English dictionary.
??? A. have????? B. has??? C. there is??? D. there are

19.? They each ____ a beautiful handkerchief.
??? A. have?????? B. has?????????? C. there is???? D. there are

20.? Between the two rows of trees _____the teaching building.
??? A. stand?? B. stands???????? C. standing?? D. are

【答案解析】

?11-15 CDABA ??16-20 BCBAB?