The world is not only hungry but also thirsty for water. This may seem strange to you ，since 1 70% of the earth's surface is covered with water. But about 97% of that is sea water or salt water. Man can only drink and 2 the other 3% of fresh water from rivers,lakes,underground and so on. And we can not even use all of that 3 some of it has been made dirty.

  Earth Day is April 22. But on all other days,we must also remember how 4 water is. The water that we use is the most important natural resource on the earth. Today we 5 serious water problems. One of them is water pollution. All kinds of things from cars,factories,farms and homes make our rivers,lakes and ocean Polluted water is very bad for people to drink. And dirty water is bad for fish,too.

  How do cars and factories make our water dirty? First they pollute the air. Then when it 7 ,the rain water makes our drinking water dirty. Dirty rain,called acid rain (酸雨).is also bad for plants,animals and buildings. Scientists say that 8 30 years,more than half of the people in the world won't have enough clean water. We have to learn how to 9 wasting water. One of the first steps is to develop ways of reusing it.

  But 10 every large city reused its water,we would still not have enough water. So we should make use of sea water by removing the salt in it. If we can take these steps,fresh water won't be used up. 

(   ) 1. A. only B. already

      C. nearly D. hardly

(   ) 2. A. use B. eat

       C. afford D. produce

(   ) 3. A. until B. when

      C. before D. because

(   ) 4. A. interesting B. different

       C. important D. exciting

(   ) 5. A. face B. save

       C. know D. discover

(   ) 6. A. nice B. dirty

       C. clean D. ugly

(   ) 7. A. rains B. blows

      C. snows D. turns

(   ) 8. A. for B. in

      C. during D. after

(   ) 9. A. enjoy B. finish

       C. keep D. stop

(   ) 10. A. as usual B. since then 

      C. even though D. in fact

5. 深秋时，校园的小路被落叶覆盖。

In late fall,the path in our school        __fallen leaves.

4. 中国政府最近通过一些法律来反对空气污染。

Recently,Chinese government has      ___air pollution.

3. 中国很多贫困地区的学校缺少教师。 

Many  schools  in  poor  areas  in China     ___teachers.

2. 我很高兴地看到院子里的小树一天天长大。

I'm very happy to see the young tree in the yard has been growing up    _

1. 张华每天都花大量的时间学习英语。

Zhang  Hua spends                 studying English every day.

5. Mingming is n         as tall as his father.

4. I'm very  t         and  I  want  to get something to drink.

3. We should follow social rules and never break 1         .

2. Scientists around the world are working to d         new medicine for cancer.