The students were having their chemistry class. Miss Li was telling the children what water was 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?” “I’m sorry，children.” said the teacher，“Our water is getting dirtier and dirtier．That’s a problem.” 小题1:The students were having their _______ class． A．English B．Chinese C．chemistry D．maths 小题2:Miss Li was telling the children what ______ was like． A．water B．air C．earth D．weather 小题3:A boy said，“The water in the river behind my house is always _______．” A．white B．black C．clean D．clear 小题4:Most of the children _______ the boy． A．agreed with B．wrote to C．heard from D．sent for 小题5:The 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