23. ______that he was in great danger, Eric walked deeper into the forest.

A. Not realized　　　 B. Not to realize　　　 C. Not realizing　　　　 D. Not to have realized

22. _____ their hats into the air, the fans of the winning team let out loud shouts of victory.

　 A. To throw　　　 B. Thrown　　　　 C. Throwing　　 D. Being thrown

21. We had an anxious couple of weeks _____ for the results of the experiment.

　 A. wait　　　　　 B. to be waiting　　　 C. waited　　　 D. waiting

20. _______ around the Water Cube, we were then taken to see the Bird’s Nest for the 2008 Olympic Games.

A. Having shown　　 B. To be shown　　 C. Having been shown　　 D. To show

19. The message is very important, so it is supposed　　　　 as soon as possible.

A. to be sent　　　 B. to send　　　 C. being sent　　　 D. sending

18. The director had her assistant ___ some hot dogs for the meeting.

A. picked up　 B. picks up　 C. pick up　 D. picking up

17. I like getting up very early in summer. The morning air is so good ______.

A. to be breathed　 B. to breathe　　 C. breathing　 D. being breathed

16. Please remain______; the winner of the prize will be announced soon.

A. seating 　　　　　　　　　 B. seated 　　　　　　　　　　 C. to seat 　　　　　　　　　　　　　 D. to be seated

15. He was busy writing a story, only______once in a while to smoke a cigarette.

A. to stop 　　 B. stopping 　 　　C. to have slopped 　　　　 D. having stopped

14. We finished the run in less than half the time ____.

A. allowing　　　　　 B. to allow　　　 　　　C. allowed　　　 D. allows