Life today is much easier than that of hundreds of years ago.But there are new problems.One of the biggest --------- is pollution. The pollution comes in many -------.we see it, drinks it and even -------- it.
Humans have been polluting the earth. The more people there are, the ------- pollution there will be. Many years ago, the problem was not ---------- because there were not so many people. In the past, when the land was --------- up or the river was dirty in one place, humans -------- to another place. But humans are now slowly polluting the whole world.
Air pollution is the most serious problem. It's bad for all ------- things in the world. Waterpollution kills fish and pollutes our drinking water. Noise pollution ------- us get angry more easily.
The earth is our home.we must take care of it. That means ------- the land, water and air clean.
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