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.
