单词拼写 。
1. Many children s_______ to death every year in Africa because of the lack of food.
2. Without the teacher's p_______, you cannot play with the computer in our class.
3. Wu must keep the b_______ of nature.
4. We don't have the p_______ to hear such an empty talk.
5. Don't be r______ to your friends. You should be friendly to each other.
6. As is known to all, smoking is h_______ to our health.
