阅读理解。
The students were having their chemistry (化学)class. Miss Li was telling the children what water is like. After that, she asked her students, “What’s water? ” No one spoke for a few minutes. Miss Li asked again, “Why don’t you answer my question? Didn’t I tell you what water is like? ”
Just then a boy put up his hand and said, “Miss Li, you told us that water has no colour and no smell. But where to find such kind of water? The water in the river behind my house is always black and it has a bad smell.” Most of the children agreed with him.
“I’m sorry, children,” said the teacher, “our water is getting dirtier. That’s a problem.”
(   )⑴The students were having their _________ class.
A. English       B.Chinese     C.chemistry    D.maths
(   )⑵Miss Li was telling the children what _________ is like.
A.water         B.air         C.earth         D.weather
(   )⑶A boy said, “The water in the river behind my house is always _________.
A.white        B.black      C.clean         D.clear
(   )⑷Most of the children _________ the boy.
A.agreed with        B.wrote to        C.heard from        D.sent for
(   )⑸The water in the river has colour and smell because it is getting _________.
A.more and more
B.less and less
C.cleaner and cleaner
D.dirtier and dirtier