The world itself is becoming much smaller by using modern traffic and modern communication means. Life today is much easier than it     1    hundreds of years ago,       2     it has brought new problems. One of the    3     (big) is pollution. Pollution comes in many     4     (form). We see it, smell it, drink it and even hear it.

Man has been polluting the earth. The more people, the more pollution. Many years ago, the problem was not so serious    5     there were not so many people. When the land     6     (use) up or the river was dirty in one place, man moved to another place. But this is no longer true. Man is now     7    (slow) polluting the whole world.

Air pollution is still the most serious. It’s bad for all living things in the world. Water pollution kills our fish and pollutes our drinking water. Noise pollution       8       (make) us angry more easily.

Many countries are making rules     9       (fight) pollution. They stop people from     10     (burn) coal in houses and the factories in the city, and from putting dirty smoke into the air.