51. ______ you make a plan for study, you have to follow it.

　　　 A. Even　　　　　　　　 B. Once　　　　　　　　　　　　 C. Unless　　　　　　　 D. Until

50. I ________ it myself ________ your homework.　

A. prefer do; rather than copy 　　　　　　　　　 B. prefer doing; than copy

C. would do; rather than copy 　　　　　　 D. would rather do; than copy

49. -Why didn’t Susan come to see us yesterday as she promised?

　 -______.

　 A. She must be busy 　　　　　　　　　　 B. She might have been free

　 C. She must have been busy　 D. She can’t be free

48. ---Susan, you will come and watch TV, won’t you?

　---____．I prefer reading to ____television．

　　 A. No; watch　 　　　 B. No; watching　 C. Yes, watch　 D. Yes; watching

47. On the way to the school, she was _____ in a heavy rain. As a result, she caught a bad cold.

　 A. swallowed　 　　 B. seized 　 C. kept　　　 D. caught

46. -Will Mary go shopping with us this afternoon?

　 -______. She has to prepare for the coming English examination.

　 A. Yes　 B. I’m afraid not　 C. It’s all right　 D. Don’t worry

45. -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 read

44. During the last summer vacation, all the students had plenty of ______ and got a lot of practical　 ______ in the factory.　

　 A. exercises; experiences　　　　　　　　 B. exercises; experience

C. exercise; experience　 　　　　　　 D. exercise; experiences

43. - How do you learn English so well?

　 - ______ it every day.

　 A. In speaking　 B. By speaking　 C. With speaking 　　　 D. On speaking

42. First of all, please _____ me to introduce myself to you．

　 　　 A. make　　　 B. agree　　　 　 C. let　　　 D. allow