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Correct Answer: B) Lack of obligation.
Correct Answer: C) Didn't need to go.
Correct Answer: C) Advice.
Correct Answer: A) Have.
Correct Answer: D) Mustn't.
Correct Answer: A) Must.
Correct Answer: D) Have to.
Correct Answer: A) Will be able.
Correct Answer: B) Don't have to.
Correct Answer: A) You can.
Correct Answer: A) May.
Correct Answer: C) Didn't do.
Correct Answer: C) Permission.
Correct Answer: B) Must.
Correct Answer: C) A will.
Correct Answer: C) Needn't have done.
Correct Answer: D) Present.
Correct Answer: C) Have bought.
Correct Answer: B) May.
Correct Answer: B) You weren't careful enough.
Correct Answer: C) Had better not.
Correct Answer: C) Mustn't.