11. ________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.

A. To wait 　　　　B. Have waited 　　C. Having waited 　　D. To have waited

10. The old man, ________ abroad for twenty years, is on the way back to his motherland.

A. to work 　　　　B. working 　　　C. to have worked 　　D. having worked

9. I don't know whether you happen ________ , but I'm going to study in the U.S.A. this September.

A. to be heard 　　B. to be hearing 　　C. to hear 　　　　D. to have heard

8. Alice returned from the manager's office, ________ me that the boss wanted to see me at once.

A. having told　　 　B. tells 　　　　　　C. to tell　 　　D. telling

7. It shames me to say it, but I told a lie when ________ at the meeting by my boss.

A. questioning 　　　　B. having questioned 　　

C. questioned 　　　　　D. to be questioned

6. "We can't go out in this weather," said Bob, ________ out of the window.

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

5. When first ________ to the market, these products enjoyed great success.

A. introducing 　B. introduced 　　C. introduce 　　　D. being introduced

4. Reading is an experience quite different from watching TV; there are pictures________ in your mind instead of before your eyes.

A. to form 　　　B. form 　　　　C. forming 　　　　D. having formed

3. Linda worked for the Minnesota Manufacturing and Mining Company, ________ as 3M.

A. knowing 　　B. known 　　　C. being known 　　D. to be known

2. Don't leave the water ________ while you brush your teeth.

A. run 　　　B. running　　　 　C. being run 　　　　D. to run