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Correct Answer: A) Could.
Correct Answer: B) 3.
Correct Answer: B) He must have eaten chocolate.
Correct Answer: A) Would.
Correct Answer: B) Will.
Correct Answer: B) Should not.
Correct Answer: B) Be able to.
Correct Answer: A) Should.
Correct Answer: B) The number of infected people can increase.
Correct Answer: A) Can she sing beautifully?.
Correct Answer: B) May not.
Correct Answer: D) May is very formal while could is less formal.
Correct Answer: C) MAY.
Correct Answer: C) Since we had the time.
Correct Answer: A) Mustn't.
Correct Answer: C) Would.
Correct Answer: D) Can.
Correct Answer: A) Must.
Correct Answer: A) Will have learned.
Correct Answer: C) Can't.
Correct Answer: B) Mustn't.
Correct Answer: A) May.
Correct Answer: B) SHOULD.
Correct Answer: B) Had to.
Correct Answer: D) Was able to reach.