用所给单词的适当形式完成短文。

The world itself is becoming much smaller by using modem traffic and modem communication (通讯设备)．Life today is much___ than it was hundreds of years ago, but it has brought new problems．One of the biggest problems is ____．To pollute means to make things dirty．Pollution comes in many ways．We see it, smell it, drink it and even hear it．
Man has polluted the earth．The more people, the ___ pollution．Air pollution is still the most ____．It’s bad for all ____ things in the world, but it is not the only kind of pollution．Water pollution ___ fish and pollutes our drinking water．Noise pollution makes us angry more easily．
Many countries are ___ rules to fight pollution．They stop people from___ coal in houses and factories and from putting dirty smoke into the air．Pollution by SO2 is now the most dangerous kind of air pollution．It is caused by heavy traffic．We are sure that if there are fewer people driving, there will be___ air pollution．The earth is our home．We must take care of it．That means ___ the water, land and air clean