完形填空

　　The students were having their chemistry(化学)class．Miss Li was telling the children 　　1　　 water was like．After that, she asked her students,“What's water?”　　2　　 spoke for a few minutes．Miss Li asked again,“Why don't you answer my question?Didn't you 　　3　　 me carefully just now?”

　　Just then a boy 　　4　　 his hand and said,“Miss Li, you tell us that water has no color and no smell．But where to 　　5　　 such kind of water?The water in the river behind my house is always black and it has a 　　6　　 smell．”Most of the children agreed 　　7　　 him．The boy went on saying：“My family and neighbors are 　　8　　 about the water．We wonder when and how we can stop the factories from 　　9　　 the river．”

　　“I'm sorry, children．”said the teacher,“Our water is getting 　　10　　．That is what we should talk about next．”

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