4. We should not spit in a public place/ cut down the trees
3. We should not throw litter onto the ground
2. It is very important to take care of our environment
1. It’s our duty to protect our environment.
1、 环保
5、 单词拼写
4、 名词复数
3、 状语
2、 时态搭配
1、 主谓一致: