1．I watered the flowers this morning, but it rained at 9：00 a．m., so I needn’t ____________ (water) them.
答案：have watered
2．We didn’t need ____________(worry) about tickets. The travel agency arranged all the things for us.
答案：to worry
3．I need someone ____________ (help) me out of the problem raised by my teacher in the class.
答案：to help
4．(湖南卷)We’ve had a good start, but next, more work ____________ (do) to achieve the final success.
答案：needs to be done/doing
5．What a pity！You could have entered free—you needn’t ____________ (buy) a ticket.
答案：have bought
6．You need ____________ (let) me know by Monday if you want to take part in the English speech contest.
答案：to let
7．—Must I tell Mary about the news that she will hand in her homework by Friday?
—No, you ____________. I’ve told her already.
答案：needn’t
8．You don’t need ____________ (worry) about his safety. After all, he is no longer a child.
答案：to worry
9．She needn’t ____________ (finish) the work today，need she?
答案：finish
10．She doesn’t need ____________ (finish) the work today, does she?
答案：to finish
