58. Jack said that he ___________ (not go) over his lessons yet.

57. The boy said that he ___________(not break)the window.

56. I didn't return the book to the library，because I _________(not finish)reading it.

55. ______ they _______(pick)all the apples before the farmer got there?

54. How many English words _________ you _________(learn)by the end of last term?

53. Mr. Brown _______________(live)in London for ten years by the end of last month.

52. She _______(work)in a factory for three years before she went to college.

51. My brother _________(make)so many American friends since he went there two years ago.

50. Our physics teacher ____________________(not come)to work today，because he is ill.

49. ________ the train _________(arrive)?---No，not yet.