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Correct Answer: E) Not having the obligation.
Correct Answer: A) May.
Correct Answer: D) May.
Correct Answer: A) Should.
Correct Answer: C) Can.
Correct Answer: C) DON'T HAVE TO.
Correct Answer: B) DON'T HAVE TO.
Correct Answer: C) Mustn't.
Correct Answer: C) Might.
Correct Answer: C) Can't.
Correct Answer: A) They're close friends.
Correct Answer: C) Have to.
Correct Answer: C) Must.
Correct Answer: C) A might.
Correct Answer: A) Ought to.
Correct Answer: D) Add ed when talking about the past.
Correct Answer: A) Mustn't.
Correct Answer: B) Willingness.
Correct Answer: A) Ability.
Correct Answer: B) Shouldn't.
Correct Answer: B) Should.
Correct Answer: B) Permission.
Correct Answer: A) Shall.