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