1. I take my dog out for a walk _______(one) a day.
2. There's somebody _______(hide) behind the door.
3. Sandy does her homework _______(careful) than Tom.
4. There are many tall _______ on both sides of the street. (build)
5. Why does she look _______ today? What's the matter? (worry)
6. He is old enough. He can do it by _______. (he)
7. It's great _______ to play with my pet. (funny)
8. Please write a short passage about your dog at _______ 100 words. (little)
9. Many _______ come to visit the Great Wall every year. (visit)
10. Don't climb over the wall. Look! It says, "It's _______" (safe)

1. 桑迪和她的姐姐共住一个房间。

Sandy _______ a _______ _______ her sister.

2. 我经常带着狗在公园里散步约半个小时。  

I often _______ my dog _______ a _______ for about _______ an hour in the park.

3. 和他们一起做模型飞机怎么样？ 

What about _______ a _______ plane with _______?  

4. 你们学校有多少老师？ 

_______ _______ _______ are there in your school?

5. 这个用中文怎么说？  

_______ do you _______ this _______Chinese?

6. 露西喜欢和朋友在网上聊天吗？

_______ Lucy like_______ _______ her friends on the _______?

A. in; for
B. on; for
C. on; as
D. at; on