35. He was busying writing a story, only ____ once in a while to smoke a cigarette.

A. to stop　　　 　　 B. to have stopped　 　　 C. stopping　 　　　　 D. being stopped

34. -Mum, you always tell me that if I work hard, I will pass the exam.

-But you must admit that you ____, so far.

A. didn’t　　　　 　 B. hadn’t　　　　　 　 C. haven’t　　　　　 D. don’t

33. There is a new problem involved in the popularity of private cars ____ road conditions need to be improved.

A. that　　　　　 　 B. which　　　　　 　 C. where　　　　　　 D. when

32. The Opening Ceremony of the 29^th Olympic Games is a great success, ____ that has surprised the world.

A. it 　　　　　　　　　　　 B. one　　　　　　 　 C. the one　　　　　 　 D. which

31. Thank you for all your hard work last week. I don’t think we ____ it without you.　　

A. can manage　 　　 B. could have managed　 C. could manage　　 　 D. can have managed

30. After walking for ten minutes, she suddenly realized that she ____ in the wrong direction.

A. was walking　 　 B. has been walking 　　 C. had been walking　 　 D. walked