12.Her mother ______ for more than three years.

　　 A. has died

　　 B. had died

　　 C. is dead

　　 D. has been dead

11.New York is bigger than ______ in the United States.

　　 A. any other city

　　 B. any cities

　　 C. any city

　　 D. other cities

10. --______ we go at 8:00? --What about _______ it a little earlier?

　　 A. Shall, making

　　 B. Shall, to make

　　 C. Will, making

　　 D. Will, make

9.The twins will go fishing with us this weekend _______ they are free.

　　 A. though

　　 B. if

　　 C. whether

　　 D. but

8.Life on earth ______ impossible unless we stop destroying the forest and poisoning the oceans.

　　 A. was

　　 B. has been

　　 C. will have been

　　 D. will be

7.Lily is said ______ for London last month.

　　 A. to have left

　　 B. to leave

　　 C. to be leaving

　　 D. to be left

6.If I _______ there earlier, I ________ him.

　　 A. had arrived ,would have met

　　 B. have arrived, would have

　　 C. arrived, have met

　　 D. arrived, had met

5.We are looking forward to seeing you again,and we'll be very disappointed if you ______.

　　 A. didn't come

　　 B. haven't come

　　 C. won't come

　　 D.don't come

4.Not until this evening ______ that the meeting had been put off.

　　 A. I did know

　　 B. did I know

　　 C. I knew

　　 D. I have known

3.They talked in a low voice ______ be heard by others.

　　 A. so not as to

　　 B. so as not to

　　 C. so as to not

　　 D. so as to