词汇篇
一、根据句子意思和汉语提示写出适当的单词。
1. Don’t throw (垃圾) everywhere. Everyone has the duty to protect the
environment.
2. To keep the air clean, the government encourages people to take public (交通工具) as often as possible.
3. When I arrived home, my mother was (打扫) the floor.
4. It’s a good habit to put litter into the (垃圾箱).
