We mustn't waste water ________ there is not enough water on the earth.

A. so

B. until

C. because

D. but

This year,we have met a once-a-century drought( 旱灾 )in Yunnan. It makes us water is the “life blood”of our earth. Like air and sunshine,It is very important to livingthings. Without water,there can be life on the earth. All animals and plants need water. Man also needs water. We need water to drink,to cook and to clean . It even the greater part of our bodies.

Water is almost everywhere. Even in the places of the world,there is water in the air. However,we can not drink sea water fresh water.

To make things even worse,people often to keep the water clean. They throw rubbish into rivers,lakes and seas. So not all the fresh water is for us to drink. a member of the earth,we mustn’t waste water any more. Something must be to protect water.

1.A. to know B. knowing C. know D. knows

2.A. none B. not C. much D. no

3.A. himself B. ourselves C. him D. our

4.A. made of B. makes up C. makes D. made in

5.A. drier B. wetter C. driest D. beautiful

6.A. or B. so C. and D. but

7.A. decide B. fail C. try D. take

8.A. clean enough B. enough clean C. enough good D. dirty enough

9.A. For B. To C. As D. At

10.A. done B. did C. doing D. do