Water may be the most serious problem in the world. Is this 　16 　to you? You may think that nearly 70% of the 　17 　is covered with water. Yes, it is 　18 　. But about 97% of it is sea water or salt water, and it can’t be drunk used. People can only drink and use the 　19 　3%. The water 　20 　only from rivers, lakes and underground. And we can not even use all of that, because iceberg 　21 　some of it. Even 　22 　, some of the water has been polluted.

Of course, this little water is still 　23 　for us if no more water is wanted and some of it can be 　24 　back again. But today more and more water is 　25 　; for more and more people, more and more factories… We must take steps to do with this problems. One of the first steps is to develop 　26 　of reusing water. Another way is to use 　27 　water by 　28 　the salt out and this began in many countries. But it 　29 　too much. How serious the water problem is!

　30 　in the end of the next century, there will be drinking water only.　

16.(　　 ) A. new　 B. strange　 C. easy　 D. interesting

17.(　　 ) A. land　 B. world　 C. earth　 D. moon

18.(　　 ) A. true　 B. wrong　 C. right　 D. trouble　

19.(　　 ) A. other　 B. another　 C. one　 D. more

20.(　　 ) A. starts　 B. brings　 C. goes　 D. comes　

21.(　　 ) A. gets　 B. covers　 C. takes　 D. uses　

22.(　　 ) A. more　 B. worse　 C. better　 D. harder

23.(　　 ) A. clear　 B. good　 C. well　 D. enough

24.(　　 ) A. turned　 B. come　 C. become　 D. grown

25.(　　 ) A. frozen　　 B. lost　 C. needed　 D. kept

26.(　　 ) A. rules　 B. roads　 C. ways　 D. problems

27.(　　 ) A. river　 B. sea　 C. lake　 D. dirty

28.(　　 ) A. taking　 B. getting　 C. coming　 D. moving

29.(　　 ) A. gives　 B. costs　 C. spends　 D. uses

30.(　　 ) A. Nearly　 B. Although　 C. Of course　 D. Maybe

15.(　　 ) In one of the TV programs I saw ______ tigers could be trained to act!

A. the　　　　 B. that　　　 C. that the　　　　　　 D. /

14.(　　 ) Is it ______ that a ______ tiger has been seen in the village?

A. true, real　 B. truly, really　 C. real, true　 D. really, truly

13.(　　 ) There ______ no tickets for the concert ______ the booking office.

A. had, at　 B. were, at　 C. have, in　 D. is, in

12.(　　 ) I will tell him the news as soon as he ______.

A. arrives　　 B. gets to　　　　 C. reaches　　 D. will arrive at

11.(　　 ) –Your car is so old. How long have you had it?　 -- ______1992..

A. In　　　　 B. Since　　 C. From　 D. Before

10.(　 ) The word “an” is made up with ______ “a” and ______ “n”.

A. a, an　 B. an, a　 C. the, the　 D. an, an