根据句意和首字母提示补全单词. |
1. Don't w________ water. Please turn off the cock after you wash your hands. 2. Gold, silver and iron are all m_______. 3. It's more and more important for everyone to save e_______ now. 4. Air p_______ is quite harmful to our health. 5.The students from a green school are helping collect waste paper and bottles for r________. |