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) o 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.

48. My grandson ______________(be)ill for a week.

47. We _______ already _______(draw)five pictures.

46. How long _______ your mother _______(teach)English in this school? ---For ten years.