I think, you ___________ read more books.

  • does
  • must
  • done
  • must been

He ___________ sat there for three hours.

  • has
  • does
  • do
  • be

What ___________ the doctor's advice to the patient?

  • were
  • are
  • is
  • am

Why did she ___________ this foolish act?

  • does
  • done
  • do
  • doing
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