Ⅰ、1、easy
2、wash
3、napkins
4、recycling
5、use
Ⅱ、1 - 6 C B C C C B
Ⅲ、1、Did ;have
2、Don't use
3、What did ;use
4、was built
5、don't agree with
Ⅳ、1 - 5 A C D B C
6 - 10 B A D C B
Ⅴ、1、The air pollution problem.
2、Because the environment of the city is very poor.
3、The reasons why the writer wants to solve the air pollution problem.