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Correct Answer: B) Use 'have to' to express obligation in English.
Correct Answer: C) Couldn't.
Correct Answer: A) Couldn't.
Correct Answer: B) Couldn't.
Correct Answer: B) Yes, of course. I'll unclog the toilet.
Correct Answer: A) Hey, can I borrow your car tonight?.
Correct Answer: C) Could.
Correct Answer: B) PERMISSION.
Correct Answer: C) Can.
Correct Answer: C) Can / but.
Correct Answer: A) May.
Correct Answer: D) Can.
Correct Answer: A) Have to work.
Correct Answer: D) Should.