If you are under 13 you _____ to get your parents' permission.
   A) have
   B) must
   C) musn't

  Why didn't you help him? You _____ have done it.
  A) must
  B) can
  C) could
  D) were to
  E) was able to

  If I were you I _____ complain.
   A) shouldn't
   B) should to not
   C) should not to

  Betty has a temperature. She _____ be ill.
  A) had better
  B) used to
  C) can not
  D) must

  We _____ forget to take the chicken out of the freezer.
   A) have to not
   B) must
   C) mustn't

  If only you'd mentioned that your friend played tennis. We _____ a
  game of doubles.
  A) can have
  B) could have had
  C) might have
  D) could have

  I _____ speak French without a problem now because I have had many lessons.
   A) may
   B) can
   C) have

  Your daughter may _____ try on a few different sizes.
   A) have to
   B) had to
   C) must

  One of the US national security advisers _____ there _____ better intelligence sharing before the September 11 attacks.
  
   A) had acknowledged / can be
   B) acknowledges / might be
   C) has acknowledged / could have been
   D) acknowledged / must be
   E) would acknowledge / will have been

  A: I_____ play the guitar.
  B: But you said yesterday you _____ play it.
  A) can't / could
  B) can / could
  C) couldn't / can
  D) could / could