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Correct Answer: A) Must have forgotten.
Correct Answer: B) Can't have stolen.
Correct Answer: A) Must.
Correct Answer: B) Don't have to.
Correct Answer: B) Mustn't.
Correct Answer: B) You should go to the doctor.
Correct Answer: B) Must.
Correct Answer: D) This book can cost a lot.
Correct Answer: B) Doesn't have to.
Correct Answer: A) Shall / will.
Correct Answer: C) Could.
Correct Answer: A) FALSE.
Correct Answer: B) Can't have.
Correct Answer: A) Would.
Correct Answer: A) Could.
Correct Answer: C) Might.
Correct Answer: B) HAVE TO.
Correct Answer: D) Have to.
Correct Answer: A) Mustn't.
Correct Answer: D) Ought to.
Correct Answer: C) Don't have to.
Correct Answer: C) Ought to.
Correct Answer: A) Don't have to.