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Correct Answer: C) Couldn't have cleaned it.
Correct Answer: C) Have to / has to.
Correct Answer: A) Had to.
Correct Answer: A) Needn't walk.
Correct Answer: C) Had to.
Correct Answer: D) May not.
Correct Answer: B) Could.
Correct Answer: B) Need to.
Correct Answer: C) Can't.
Correct Answer: D) Sorry, I'm using it.
Correct Answer: D) Might.
Correct Answer: B) Mustn't.
Correct Answer: A) Depends of your time.
Correct Answer: B) Shouldn't.
Correct Answer: B) COULD.
Correct Answer: A) Should.
Correct Answer: D) Can.
Correct Answer: B) It's somethig certain.
Correct Answer: B) Must.
Correct Answer: D) Would.
Correct Answer: B) ABILITY.
Correct Answer: B) Unless he shows up.
Correct Answer: D) Should.
Correct Answer: C) Must.