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Correct Answer: E) Obligation.
Correct Answer: D) Should.
Correct Answer: A) Must not.
Correct Answer: D) Must.
Correct Answer: C) Dizzy.
Correct Answer: B) Could.
Correct Answer: B) You had to listen to the lecture attentively.
Correct Answer: C) Should.
Correct Answer: C) Must.
Correct Answer: A) A needn't.
Correct Answer: B) Obligation.
Correct Answer: B) Can't.
Correct Answer: D) Might.
Correct Answer: A) Have to.
Correct Answer: B) Couldn't have known.
Correct Answer: B) Must.
Correct Answer: C) Sara must need.
Correct Answer: C) Was allowed to.
Correct Answer: B) May.
Correct Answer: B) Might.
Correct Answer: A) Can.
Correct Answer: C) May.