Life today is much better. However, there are new problems. One of the biggest ones is how to【小题1】 our environment. Waste water has made rivers dirty. It kills fish and 【小题2】 our drinking water. Noise pollution makes us speak 【小题3】 and become angry more 【小题4】. Air pollution is the most serious. It’s bad for all 【小题5】 things in the world.