根据句意及首字母完成单词。
1. Now it gets warmer and warmer because the p_______ is getting more serious.
2. We should do something for e_______ protection, so that we can protect the earth.
3. It is h_______, although we do something to make it better.
4. We should r________ waste and save energy.
5. This is a s________ question. I can answer it easily.
6. Do you know the d________ between the Internet and the World Wide Web?
7. We should buy p________ made in China.
8. Don’t do h________ to the environment.
9. It's n________ to protect our earth right now.
10. W________ you come here, I’ll invite you to my home.
