五.选择填空。   (25%)

(   )21.There will be _______ pollution in the future 

in the world. 
    A.more     B.many      C.fewer     D.few

[   ]22. Kids won’t go to school. They will study _____ home ______computers.

       A. in, in   B. at, on   C. at , by  D. at; from

[   ]23.People will live ______ 200 years old in the future.

       A. /   B. be   C. to be   D. in

(   )24. What do you think Mike will be___five years?

A.after   B.in     C.for     D.before

[   ]25. ---Will there be fewer trees? ---__________.

A.Yes, there will.    B.Yes, they will.

C.No, there aren’t.  D.No, they won’t.