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Correct Answer: B) Could.
Correct Answer: C) Conjecturing a certain possibility in the past.
Correct Answer: A) Mustn't.
Correct Answer: B) I wasn't able to go there.
Correct Answer: C) Have to.
Correct Answer: A) Must.
Correct Answer: A) Should.
Correct Answer: D) Conjecture for past events (not very certain).
Correct Answer: B) Need, May.
Correct Answer: D) Will have to.
Correct Answer: B) Don't have to.
Correct Answer: D) Desire (formal, polite).
Correct Answer: D) Could.
Correct Answer: B) Should.
Correct Answer: D) Can / could.
Correct Answer: B) Can't.
Correct Answer: D) Must.
Correct Answer: C) Must.
Correct Answer: C) Would.
Correct Answer: B) Was able to.
Correct Answer: A) Couldn't.
Correct Answer: B) Have to.
Correct Answer: A) They are more formal and express tenses other than the present.
Correct Answer: B) Shouldn't.