根据句意及首字母完成单词。

1.What l________ do you speak?

2. Guangzhou is in the s________ of China.  

3. W              _to our school. We are kind to all our friends.

4. You can borrow all kinds of books from the l_________.

5. Look!Your hands are so d             __. Please wash (洗) them.

6. On weekends , we usually sleep l _________.

7. This lion is lazy. It usually r________  twenty hours every day.

8. Our teacher is f________ to us so we like her very much.

9. My grandma often tells me s________ about Lei Feng.

10. The pay phone is b_________ the post office and  the library.

制粉系统中再循环门的作用是什么？