I looked through this book about 2 hours, but _____ find anything
  interesting.
  A) can't
  B) couldn't
  C) had to
  D) can
  E) hadn't to

  A: I've got a headache.
  B: You _____ take an aspirin.
  A) has to
  B) should
  C) would
  D) used to

  No one likes _____ work at the weekend.
  A) has to
  B) had to
  C) will have to
  D) having to

  I love driving! _____ drive has changed my whole life.
  A) Can
  B) Could
  C) Will be able to
  D) Being able to

  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

  It's the right thing to do in this situation and it's my belief that you _____ to go.
   A) should
   B) might
   C) ought

  Ronald _____ left last week.
  A) should
  B) might not
  C) have
  D) might have

  My bedroom is a real mess. I _____ clean it.
  A) have to
  B) must
  C) don't have to
  D) should

  Danny doesn't feel well. He _____ to see a doctor.
  A) should
  B) ought
  C) had

  The neighbors were having a row, and I _____ hear every word they
  said.
  A) can
  B) could
  C) managed to
  D) couldn't