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Correct Answer: C) Could.
Correct Answer: A) Does.
Correct Answer: A) Didn't have to.
Correct Answer: A) Should we leave a tip?.
Correct Answer: B) Things that are not necessary to be done.
Correct Answer: B) Could.
Correct Answer: B) Would like to.
Correct Answer: B) Ought to.
Correct Answer: A) Mustn't.
Correct Answer: B) Has.
Correct Answer: D) Must not.
Correct Answer: A) Must have been copied.
Correct Answer: B) People shouldn't eat with their mouth open.
Correct Answer: B) Might.
Correct Answer: B) Can.
Correct Answer: B) Should.
Correct Answer: A) Might.
Correct Answer: A) Shall.
Correct Answer: D) Should.
Correct Answer: A) Needn't.
Correct Answer: C) Ough to.
Correct Answer: D) Can't / can.
Correct Answer: A) Can't.
Correct Answer: A) Can.