12. ________, the population of China is the largest in the world.　

　 A. It is known that　　 B. As is well known　 C. Which is well known　　　　 　　D. We all know

11. When I return to the classroom, I found my pen ________.　 A. going　 B. losing　 C. missing　 D. missed

10. – It seems that she is thinking about something.

--Yes, she cannot remember what key she _____ to her computer.　 A. set　　 B. had set　 C. has set 　D. sets

9. When she saw the _________tiger, her face turned pale__________.

　 A. frightening; with fear　　　 B. frightened; with fear　 C. frightening; as fear　　　　 D. frightened; as fear

8. The ________ look on her face suggested that she ________ it.

　 A. puzzling; hadn’t expected B. puzzled; hadn’t expected C. puzzling; wouldn’t expect D. puzzled; shouldn’t expect

7. ____ that at least a score of buildings will be built soon. A. It hopes B. It is hoped C. We are hoped 　D. It is wished

6. The play is going to _____ again tomorrow evening.　 A . produce on　 B. be put on　 C. put on　 　D. produce

5. Many people are still __ all over the world. A. gone hungry　 B. going hunger　 C. going hungry D. gone hunger

4. ________ of the truth of the report, he told his colleagues about it.

A. Convinced　　　 B. Convincing　 C. To convince　　 D. Having convinced　

3. I didn’t see her in the meeting room. She ________ at the meeting.

A. mustn’t have spoken　　 B. shouldn’t have spoken C. needn’t have spoken　　 D . couldn’t have spoken