根据句意及首字母提示写出单词。
We can r_______ paper boxes and plastic bottles to protect the environment.
We'd better use handkerchiefs(手帕) instead of paper n______．
In the past, many people couldn't a______ their food.
If we want to c_______ our environment, we should reduce our waste.
We should turn off the l ______ while we aren't using it.