Powerful though they were, they never _____ to challenge the
  authority of the King.
  A) will have
  B) dared
  C) would have
  D) could've been

  As my sister was taking an examination I _____ look after her baby
  yesterday.
  A) could
  B) had to
  C) must
  D) was able to
  E) should

  I didn't use to _____ this much TV.
   A) watch
   B) look
   C) watching

  You _____ play an instrument to enjoy classical music.
  A) don't have to
  B) didn't used to
  C) didn't have to
  D) mustn't

  Why don't you buy a lottery ticket. You _____ a large prize.
  A) might win
  B) might have won
  C) could have won
  D) must have won

  He probably _____ be back in time for dinner.
  A) isn't
  B) wasn't
  C) won't
  D) doesn't

  A: What was that noise?
  B: Oh, don't worry; it _____ the cat.
  A) should've been
  B) can be
  C) must have been
  D) ought to be

  This is an opportunity that comes once in a lifetime. We _____ let it
  pass.
  A) don't have to
  B) shouldn't have
  C) needn't have
  D) mustn't

  He would _____ to be improving.
   A) seem
   B) seems
   C) seem'd

  As Mr. John hadn't got the dictionary at hand, he _____ guess the
  meaning of the word.
  A) should
  B) can
  C) has to
  D) must
  E) had to