21.A.seas　　　　　　　　　　　　　 B.wells　　　　　　　　　　　 C.mountains　　　　　　　 D.snow

20.Seeing the driver break the traffic rules,the policeman ______ to the driver to stop.

A.spoke　　　　　　　　　　　　　　　　　　　　　　　　　　　　 B.signed

C.made　　　　　　　　　　　　　　　　　　　　　　　　　 D.let

.完形填空

A lot of water is needed in large cities.Some cities get water from 　21　 .Some get water from lakes or rivers 　22　 .But some cities have to get water from lakes or rivers far away.

Water is usually 　23　 to a city from a place higher than the city　 　24　 .When water is found only in a 　25　 place,it must be pumped up to the city.Then it is sent to each home.

　 26　 are often built in a river to keep the water from flowing away.Then a new lake is 　27　 .People know how much water they need,and allow 　28　 water to flow away below the dam.In this way the city stores water for its use.

There is usually a building near the dam,　 29　 much important work is done.For example,the water is tested 　30　 it is piped to the city.

We must　 　31　 the water clean before we drink it.Sometimes　 　32　 must be taken away from it.Sometimes medicine must be added to it.Machines mix these 　33　 things with the water.In this way,it is made drinkable.

In　 34　 hotels,you usually find three taps.One is for cold water,　 35　 is for hot water and the third is for iced water.

19.-Who is Jerry Cooper?

-______? I saw you shaking hands with him at the meeting.

A.Don’t you meet him yet　　　　　　　　　　　　　 B.Hadn’t you met him yet

C.Didn’t you meet him yet　　　　　　　　　　　　　 D.Haven’t you met him yet

18.The story happened in 1939 ______the Second World War broke out.

A.why　　　　　　　　　　　　　　　　　　　　　　　　　 B.that

C.when　　　　　　　　　　　　　　　　　　　　　　　　　 D.which

17.Was ______ that I saw last night at the concert?

A.it you　　　　　　　　　　　　　　　　　　　　　　　　　　　　 B.not you

C.you　　　　　　　　　　　　　　　　　　　　　　　　　　 D.that yourself

16.______ by the policemen,the robber had to give in.

A.Surrounding　　　　　　　　　　　　　　　　　　　　　　 B.Surrounded

C.To be surrounded　　　　　　　　　　　　　　　　　　 D.Be surrounded

15.Who,among the singers,is ______ young students?

A.famous for　　　　　　　　　　　　　　　　　　　　　　　　 B.famous as

C.popular with　　　　　　　　　　　　　　　　　　　　　　 D.known by

14.He said,“______ is a long way to school.______ a long way to go before we arrive.”

A.It;It is　　　　　　　　　　　　　　　　　　　　　　　　　　　 B.There;There is

C.There;It is　　　　　　　　　　　　　　　　　　　　　　　　 D.It;There Is

13.This book,written in such small letters,is difficult ______.

A.to be read　　　　　　　　　　　　　　　　　　　　　　　　 B.for being read

C.to read　　　　　　　　　　　　　　　　　　　　　　　　　　　 D.for reading

12. -Are all the students for this plan?

-Yes,______ students think it good.

A.the majority　　　　　　　　　　　　　　　　　　　　　　　 B.most of

C.the minority of　　　　　　　　　　　　　　　　　　　　 D.the majority of the