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Correct Answer: C) Couldn't.
Correct Answer: C) Had to have.
Correct Answer: A) COULD.
Correct Answer: C) To give advice.
Correct Answer: B) May.
Correct Answer: A) Shouldn't have left.
Correct Answer: B) SHOULD.
Correct Answer: A) May.
Correct Answer: C) Mustn't.
Correct Answer: B) Must.
Correct Answer: C) Can.
Correct Answer: A) They will still have to do it again.
Correct Answer: A) Ought to.
Correct Answer: B) Don't have to.
Correct Answer: A) Must.
Correct Answer: A) You should take some medicine.
Correct Answer: A) Can.
Correct Answer: B) Possibility.
Correct Answer: B) Might.
Correct Answer: C) Might.
Correct Answer: A) To post.
Correct Answer: A) Had better.
Correct Answer: C) Study.
Correct Answer: A) Strong Obligation.