阅读短文选择填空。
We should ________ more trees. We ______ cut down too many trees. We should stop factories from pouring （倾倒）_____ water into rivers. We should save ______. We should not drive too much. We can go to work or school by bus or ____. We can reuse paper and plastic bags. We can make the world a better（更好）place.
（1）A. water  B. plant  C. buy
（2）A. can  B. should  C. shouldn’t
（3）A. dirty  B. clean  C. much
（4）A.trees  B. energy  C. water
（5）A. by taxi  B. by car  C.on foot