30. I just don’t understand 　　　　that leads to so many teenagers becoming addicted to playing computer games.

　 A. why it does　 B. what it is　　 C. what it does　　　 D. why it is 　

29. -Do you know Henry didn’t win that speech contest?

　 -______? I thought he would. He worked so hard on it.

　　 A. Do I　　　　　 　　　　　 B. Don’t I　　　　　　　　 C. Did he　　 D. Didn’t he

28. She ought to stop work; she has a headache because she ______ all day long.

A. has been reading　 　B. had read　　 C. is reading 　D. read

27. But ______ chance and time, I carried on. I tried to think about interviewing more thoroughly.

　 A. giving　　 B. having given　 C. given　 　　D. to be given

26. ---They are quiet, aren’t they?

---Yes. They are accustomed _____at meals.

A. to talk　 B. to not talk　 C. to talking　 D. to not talking

25. To our surprise, though ______ natural resources, the area is well developed.

　 A. lacking　　 B. lacked in　　 C. lacking of　　 D. lacked

24. After the man had worked round the clock for two days, his strength seemed to have _____.

　 A. put out　 B. got out　　 C. gone out　 D. run out

23. If the firefighters ______ in time, the fire would have resulted in many deaths in the hotel.

　 A. wouldn’t have arrived　　 B. hadn’t arrived　　 C. didn’t arrive　 D. shouldn’t arrive