二、单句改错(共10小题;共10分)

　　41. I don't think he can do the work well, can't he?

　　42. You have few friends here, don't you?

　　43. Mike has to stay at home on Sunday, hasn't he?

　　44. There are few students in the classroom, isn't there?

　　45. He has never been to any foreign countries, hasn't he?

　　46. This is my backpack, isn't this?

　　47. These are my new pants, aren't these?

　　48. Let us go back home, shall we?

　　49. Jenny said that she would stay at home the next day, wouldn'tshe?

　　50. There is little time left, isn't there?