Answer: A) You don't have to get a taxi-the underground is really fast.
Explanation for this question is being written.
Answer: A) Need
Answer: B) Need to.
Answer: C) Need to.
Answer: A) Needn't
Answer: A) Don't need to.
Answer: C) Don't have to.
Answer: B) You needn't worry about these trivial things.
Answer: A) Need to.
Answer: B) Don't have to.
Answer: C) Needn't
Answer: A) You needn't do your homework now.
Answer: C) Alice doesn't have to do her homework.
Answer: A) Didn't need to call.
Answer: A) Needs to.
Answer: B) Needs to.
Answer: B) Didn't have to.
Answer: D) Don't have to.
Answer: B) Don't need.
Answer: D) Could
Answer: D) Didn't need to go.
Answer: B) Need
Answer: A) Don't have to.
Answer: C) You don't have to go to the party.
Answer: C) Need
Answer: B) Needn't
Answer: B) To tidy up.
Answer: C) Don't have.
Answer: A) Need not apply.
Answer: A) A
Answer: E) Don't have to.
Answer: B) DON'T NEED TO PAY.
Answer: B) Don't need to.
Answer: A) Doesn't have to.
Answer: B) You needn't leave the house now.
Answer: C) It's not necessary.