根据下列句子中的汉语词义写出所缺单词，每空一词。

1. They're singing to r________ money for children an rural areas.

2. It's good to keep your voice down in p________ places.

3. Give me a piece of p________. I want to write something.

4. Taiwan is the biggest i________ of our country.

5. You should be more careful when you c________ the street.

6. There are at ________ (至少) thirty birds in the tree.

7. My parents don't ________ (允许) me to stay outside on school nights.

8. Would you mind ________ (吸烟) here?

9. Nothing is ________ (不可能的).

10. Of all the ________ (季节), I think spring is the best.