Sentence Improvement

DIRECTIONS : In each question, a part of sentence is printed italics. Below each sentence, some phrases are given which can substtute the italicised part of the sentence.
51. The boy which came to see me this morgning had come from Agra.
  A.  that
  B.  whom
  C.  who
  D.  no improvement
52. His father wrote to him, "It is high time you start preparing for the forthcoming examination".
  A.  started
  B.  had started
  C.  would started
  D.  no improvement

53. I would have waited for you at the station if I knew that you would come.
  A.  have known
  B.  was knowing
  C.  had known
  D.  no improvement
54. As soon did the Manager came, the clerks started typing.
  A.  was
  B.  as
  C.  had
  D.  no improvement
55. When Vinod came home from the party, he found his wife had slept.
  A.  sleeping
  B.  was sleeping
  C.  has been sleeping
  D.  no improvement
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