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Correct Answer: C) Must.
Correct Answer: B) I couldn't.
Correct Answer: B) Has to.
Correct Answer: A) Can't.
Correct Answer: A) Must.
Correct Answer: B) SHOULD.
Correct Answer: B) Mustn't.
Correct Answer: B) Couldn't.
Correct Answer: A) Mustn't.
Correct Answer: C) Couldn't.
Correct Answer: C) SHOULD.
Correct Answer: C) Ought to.
Correct Answer: C) I mustn't.
Correct Answer: B) Can't.
Correct Answer: D) Mustn't.
Correct Answer: C) You don't have to do [ _____ ].
Correct Answer: C) Should get.
Correct Answer: D) Must.
Correct Answer: C) Might not have remembered.
Correct Answer: D) Has to.
Correct Answer: B) Ought to have bought.
Correct Answer: D) Can.