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Correct Answer: A) Is allowed to.
Correct Answer: C) Don't have to.
Correct Answer: B) Been able to.
Correct Answer: D) May be.
Correct Answer: A) Don't have to.
Correct Answer: A) Can't.
Correct Answer: B) Should.
Correct Answer: B) Would.
Correct Answer: C) 40-60%.
Correct Answer: A) Must not.
Correct Answer: A) Can.
Correct Answer: C) COULD.
Correct Answer: A) Mustn't.
Correct Answer: B) She isn't very well.
Correct Answer: B) Don't have to.
Correct Answer: C) Can't.
Correct Answer: D) May have met.
Correct Answer: C) Should.
Correct Answer: A) Could.
Correct Answer: C) Mustn't.
Correct Answer: A) John must have been very surprised to receive my letter.
Correct Answer: A) Have to is weak obligation and Must obligation by law.
Correct Answer: C) May.
Correct Answer: B) Might.