save和protect用法 — 英语词汇题
题目
用 save 或 protect 填空（首字母已给出）。1. We should s______ water because there is not much water in some places. 2. Trees can p______ the air and make it clean. 3. Don't waste paper. We should s______ paper and use both sides of it. 4. We must p______ the Earth, our only home.