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 (號召) us to ________ and protect water. Today, we’re facing terrible water problems. Among them, wastewater problem is especially ________. And the subject of World Water Day in 2017 is ＂wastewater＂.

What is wastewater? It is used water. Usually, wastewater comes from homes, ________, 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 ________ 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 ________ harmful in it.

________ must we treat(處理) 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 ________.

How can we treat wastewater? Different kinds of wastewater need different ways of treatment. Wastewater ________ homes can be reused. Then there will be ________ wastewater. Also, factory wastewater has to be cleaned ________ 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

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