12. You can’t imagine what great trouble they have _____ the problem _____.

　 　A. to solve; being talked about　　

　　 B. solving; discussing

　 　C. to solve; to talk about　　

　　 D. solving; being discussed

11. It was getting dark; I found a car _____ in a pool by the side of the road.

　　 A. to be stuck　　　　 　B. stuck　 　　 　 C. sticking　　　　　D. stick

10. In January , 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.

　 　A. it marked　　 　B. marking　　　 C. marked　 　　D. to mark

9. The old farmer, _____ the badly injured and burnt soldier, came out of the burning farmhouse, calling continuously for help.

　 A. supporting　　　　　 　　　 B. having supported　　

　 C. being supported by　　　　　 D. being supported

8. To answer correctly is more important than _____.

　 A. that you finish quickly

　 B. finishing quickly

　 C. to finish quickly　　 　

　 D. finish quickly

7. He looked around and caught a man _____ his hand into the pocket of a passenger.

　 A. put　 　　B. to be putting　　　　 C. to put　 　　D. putting

6. And there, almost _____ in the big chair, sat her little brother, who never had to be told to keep quiet.

　 A. having lost　 　B. losing　　　　 C. to be lost　 　　D. lost

5. _____ the front door _____, he had to enter the room through the back door.

　 A. Seen; painted　　　 　

　 B. Seeing; painted

　 C. Being seen; being painted

　 D. Seeing; being painted

4. _____ the diamond, he had to look for a place to hide it.

　 A. Having stolen　　 　　　 　B. Having been stolen　

　 C. Stolen　 　　　　　 　　 　D. Stealing

3. The dog, _____, will be made a good watchdog.

　A. to train properly　　 　

　 B. being trained properly　

　 C. properly to train　　 　

　 D. trained properly