He _____ have replaced the tire, it was still quite good.
  A) could
  B) can
  C) needn't
  D) had to
  E) should

  We have got plenty of time. We _____ hurry.
  A) needn't
  B) didn't use to
  C) mustn't
  D) didn't need to

  _____ careful! You are making mistakes.
  A) Be
  B) Must
  C) Do
  D) Did

  They will get hungry on the train; I think, you _____ give them
  some sandwiches.
  A) should
  B) could
  C) might
  D) had to
  E) needn't

  _____ you remember which shoe you put on first this morning?
  A) May
  B) Can
  C) Should
  D) Were