根据汉语提示,在句中填写适当的短语。
1. We must_____(保护环境)around us in order to make our homeland more beautiful.
2. Everyone of us should devote ourselves to keeping (生态平衡).
3. Let's __ (收拾干净)the broken glass before someone walks on it.
4. It is everyone's duty to save the _ (能源).
5. We often __ (利用)these waste things to make something else.