50.(　 )-- The problem is too difficult, can you show me ___ , WangLe? -- Sure.

　　 A. what to work it out　　　　　 B. what to work out it

　　 C. how to work it out　　　　　 D. how to work out it

49.(　 ) The teacher asked me _____ I needed any help.

　　 A. whether　 　　B. that　　　 C. what　　　 D. which

48.(　 )--You are not going out today, are you?--_I want to go shopping.

　　 A. Yes, I'm　 　B. No, I'm not　 C. Yes, I am　　 　D. No, I am

47.(　 ) --Is Jim at school today?-- No, he's at home__he has a bad cold.

　　 A. because　　 B. if　　　 C. though　　 　D. until

46.(　 ) _____ picture books in class, please.

　　 A. Not read　 　B. No read 　　C. Not reading　 D. Don't read

45.(　 ) ______ wonderful music it is! I like it very much.

　　 A. What　　 　　B. How a　　　 C. What a　　　 D. How

44.(　 ) -- You seem to like sweets. --_____ ,I buy sweets every week.

　　 A. So do I　 　B. So I do　　 C. So am I 　　D. So I am

43.(　 ) She thinks she can get there on time, _____ she?

　　 A. can　　　 B. doesn't　　 　C. can't　　 　　D. does

42.(　 ) ______ is the population of China?

　　 A. How much　 　B. How many　 C. How many people 　D. What

41.(　 ) He has never visited the Great Hall of the people, _______?

　 A. hasn't he　 　B. has he　　　 C. does　 　　D. doesn't he