—How clean the bedroom is!

—Yes, I am sure that someone_________ it．

A．cleans           B．cleaned              C．has cleaned          D．had cleaned

根据下列句子及所给汉语注释或通过上下文，  在答题卡上标有题号的横线上，写出空缺处各单词的正确形式。每空只写一词。

1.Many rare wild animals have    （消失）because we didn't protect them.

2.The results of the exams will be    （宣布）in the afternoon.

3.She likes the children very much and she is very    （耐心的）with them.

4.Can you give me some    （建议）?I believe they will be very useful.

5.He seldom    （回复）to the e-mails his friends send him.

6.Making a lot of noise and    (打扰)others are impolite.

7.Walking    （有规律地）is a good form of exercise for both young and old.

8.---Look! Here comes out school bus.  --- No hurry. Don't get on it    it has stopped.

9.---How clean the bedroom is!  ---Yes, I am sure that someone    it.

10.---Thank you for your help. Without your help, I couldn't work out the problem last night.

  ---It's my    ．