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.
16. I shall be grateful to you if you are of help to me now.
  A.  shall help
  B.  help
  C.  would help
  D.  no improvement
17. It is time the six years old is learning how to read and write.
  A.  was learning
  B.  learnt
  C.  has learned
  D.  no improvement

18. The summer has set out, and the days are getting warm.
  A.  set up
  B.  set in
  C.  set off
  D.  no improvement
19. He plays cricket and tennis also.
  A.  besides
  B.  both
  C.  too
  D.  no improvement
20. The doctor examined my pulse.
  A.  saw
  B.  felt
  C.  observed
  D.  no improvement