45. -Who’s that man under the tree? Is it Mr Black, our new English teacher?

-It_______ be. Mr Black has gone to Shanghai for a holiday.

　 A. mustn’t 　　　　　　　　 B. can’t 　　　　　　　 　　 C. needn’t

44. You can only turn left when you see the _______sign.

A　　　　　　　　 B　　　　　　　　　 C

43. We shouldn’t go to school _______breakfast. It’s bad for our health.

　 A. with 　　　　　　　　　　 B. after　　　 　　　　　　 C. without

42. There _______a wonderful movie on show this weekend. Would you like to go with me?

　 A. is going to have　　 　　　　 B. is going to be　 　　　　　　 C. is going to has

41. _______ the one-child policy, our country has controlled the population successfully.

　 A. Thanks to　　　 　　　　　　　 B. Thanks for　　　 　　　　 C. As for

40. Everyone should save every drop of water. Remember to _______the tap after you finish washing.

A. turn off　　 　　　　　　　　　 B. turn down 　　　　　　　　　 C. turn on

39. Our city is becoming nicer. Look! There are many trees and flowers on _______ sides of the streets.

　 A. all　　 　　　　　　　　　　　 B. each　　　 　　　　　　　　　 C. both

38. We used to study in the old building_______ was broken down last year.

　 A. which　　　 　　　　　　　 B. where　　　 　　　　　　 C. what

37. -How long _______it _______ you to work out such a difficult problem?

　 -About thirty minutes.

　 A. did… take　　 　　　　　　　　 B. does… take　 　　　　　　　 C. did…cost