20. When my dentist asked me some questions, I couldn’t answer him because________.

　 A. my mouth was full of cotton wool 　B. my dentist was talking all the time

　 C. I had a toothache 　 　　　　　　　　D. one of my teeth had just been pulled out

19. -I feel like inviting you to dinner tomorrow, Mr. Brown.

-____________.

A. Oh, no. Let’s not 　　　　　　　　　 B. I’d rather see a film

C. I’m very sorry, but I have other plans 　D. Oh, no. That’ll be too much trouble

18. This article is so difficult that it is ______our understanding.

A. through　　　 B. within　　 　　　 　　　 C. beyond　 　　　　 　　　 D. over

17.-Could you look after my baby for me while I am away?

-______. A. No, thanks 　　　 B. With pleasure 　C. I have no time 　 D. I'm sure you will

16. -What do you think of the book?

-Oh, excellent. It’s worth ______ a second time.

A. to read 　　　　　　　　 B. to be read 　　　　　　 C. reading 　　　　　　　　 D. being readn

15. The concert given by the famous Hong Kong singer ______ to be disappointing. A. looked out　 　 B. turned out　 　 C. found out　 　　 D. pointed out

14. -Will you be on ______ holiday soon?

-Well, I’m too busy to take ______ holiday now.

A. /; a　　　 　　　　　　　 B. a; a　 　　　　　　　　　　 C. the; the　　 　　　　　 D. /; the

13.　 -How did you find your visit to the Summer Palace yesterday?

　　　 -_________. I got separated from my 80-year-old grandparents

　　　 A. It couldn’t be better　　　　　　　　　　　　　　　　 B. I have no idea

　　　 C. Good luck to me　　　　　　　　　　　　　　　　　　 D. It couldn’t be worse