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Correct Answer: B) Shouldn't.
Correct Answer: C) Ought.
Correct Answer: B) Should.
Correct Answer: A) Should.
Correct Answer: B) They should have been at home by eleven o'clock.
Correct Answer: D) Should not eat.
Correct Answer: A) You should sleep early.
Correct Answer: D) Needn't.
Correct Answer: B) Ought to.
Correct Answer: D) You weren't so rude any more.
Correct Answer: A) Mustn't.
Correct Answer: D) Don't have to.
Correct Answer: C) She had better not stay in bed.
Correct Answer: A) Has.
Correct Answer: C) Look.
Correct Answer: B) Mustn't.
Correct Answer: B) Should have.
Correct Answer: C) Have.
Correct Answer: D) Had better.
Correct Answer: C) Look after.
Correct Answer: B) You must keep the house clean and tidy.
Correct Answer: C) 'd better.