阅读下列短文，根据上下文及空格中所给的单词首字母，填入一个适当的词，使短文意思完整。

         Water is important for us. We drink it every day. We use it to cook and w    1     things. W    2     water,

we can't live. Sometimes there is not e    3    clean water. In the future, it may be a big p    4     . So we should

not w    5    water.

         What can we do? Use l    6    water during the daytime. Take shorter shower (淋浴). Five to ten m    7    

enough. D    8    leave the water running for a long time.

         Try to s    9      every drop of water. That way, we can all have c   10     water for years and years.