----- Do you see why he hasn’t turned up yet? ----- Sorry, I don’t know _______.

A. should have caught.　B. had caught　　C. would have caught.　 D. could catch

A. had you better eat; Both　　　　　B. would you like; All

C. do you like most ; None　　　　　D. would you rather have; Either

A. Yes, thanks. 　　B. Why not?　　　C. No, go away 　　D. It's a pity.

A. by, by 　　　B. on; by　　　　C. by; in　　　　D. by; on

A. that, that 　　　B. which; that 　　　C. what; as 　　　D. that; which

A. more B. better C. worse D. rather

A. I guess not so B. I don’t guess C. I don’t guess so D. I guess not

A. She is too lazy B. Because she is too weak

C. As she is not expert enough D. Her lack of experience

A. hardly B. less C. no D. not

A. one B. he C. one who D. he who