1. is of it to be in s It a in In us an to of be s us a to of a On is an of as is as a we in In we a of to In my in to so s its a I a to to 008 As a I to my a a to In of to a by DP by %, 0,000 s be of in be be its be be My I to of As an Im to my in I to to 008. 3. a is to a by 7% 8% in in we t In of s of to s it is a to it as a In ow 何保持健康体魄is to of no to to do is on do to to us In up go do to If a no to do to is to to of a or a to a of he to to If is to be in an is a in to is my to to a in Its to 约水是我们每个人的责任。）As we is to （我们知道，水对人类来说是非常的重要。）we t （没有水我们就不能生存。）of is to is （适合人类喝的水是越来越少了。）t （但是有些人却不关心或不在意。）a of in （日常生活中他们浪费很多水。）in to 更糟糕的是他们排放污水到河流里。） （他们还乱扔垃圾到河流理去。）很多河流湖泊已经受到严重污染。） Somet