用方框中所给单词的适当形式填空，每词仅用一次（每空一词)。

wet    they    away  different  join

As we all know, waste sorting (垃圾分类）is a big event around the world. We really hope everyone can us to do the following things..

*Don't throw unwanted books. Put in the Recyclable Waste Bin. As for unwanted paper cups, photos and toilet paper, they should go to Dry Waste Bin.

*After having meals in the dining hall, put the leftovers, vegetables and fruit you don't eat in the Waste Bin.

*Never throw away plastic bags everywhere. They are a kind of harmful waste.

A small action can make a big . So work together to save the earth.