Peopleshowthanksto（nurse）becau-优题课

March 22nd is World Water Day．It started in 1993．It not only makes us think about the importance of water，but also calls on （号召） us to （1）　　and protect water．Today，we're facing terrible water problems．Among them，wastewater problem is especially（2）　　．And the subject of World Water Day in 2017 is"wastewater"．

What is wastewater？It is used water．Usually，wastewater comes from homes，（3）　　，hospitals and so on．It is produced by different kinds of activities，including washing the machines，taking showers and using the kitchen．The rain also（4）　　wastewater when it is running down the street during a storm．No matter where it comes from，this kind of water is sure to have（5）　　harmful in it．

（6）　　must we treat （处理）wastewater？Wastewater has a big influence on our life．It causes both illness for us and pollution for the environment．We must care for our environment and our own （7）　　．

How can we treat wastewater？Different kinds of wastewater need different ways of treatment．Wastewater（8）　　homes can be reused．Then there will be（9）　　wastewater．Also，factory wastewater has to be cleaned（10）　　it goes back to nature．

1．A．drink	B．save	C．carry	D．watch
2．A．easy	B．popular	C．small	D．serious
3．A．factories	B．lakes	C．rivers	D．seas
4．A．gets back	B．hands in	C．changes into	D．picks up
5．A．nothing	B．something	C．nobody	D．somebody
6．A．What	B．Who	C．Why	D．How
7．A．work	B．interest	C．health	D．business
8．A．on	B．for	C．with	D．from
9，A．less	B．more	C．better	D．worse
10．A．and	B．whether	C．after	D．before

I don 't know the man． The man is talking with our headteacher（改为含有定语从句的复合句）

I don't know the man　　 talking with our headteacher．

Lucy' s mother often makes her read English aloud at home．（改为被动语态）

Lucy is often made　　 English aloud at home．

The old couple married thirty years ago．（改为同义句）

The old couple have　　 for thirty years．

He used to go mountain climbing with his friends．（改为一般疑问句）

　　 he　　 to go mountain climbing with his friends？