Pollution is one of the biggest problems in the world today.In many places，rubbish is thrown into lakes and rivers.（1）　　

    In some cities，the air is filled with pollution.（2）　　 If it is not cleaned up，more people will be hurt.

   （3）　　 Land and water pollution kills many animals every year.

    If we do not act to improve the environment，more living things will be killed by pollution.

   （4）　　

    We should separate rubbish into different groups.In this way，it can be recycled and reused.We had better plant more trees.（5）　　 What's more，we shouldn't put the waste into lakes or rivers.

    If we can do these，we will make the world a better place to live in.

A.This makes some old people and children ill. B.As well as people，animals are also harmed by pollution. C.We can make our lakes and rivers cleaner and cleaner. D.It's time for all of us to take action right away! E.Because of this，these places have already been polluted. F.Trees reduce dust and help keep the air clean. G.A few of us should take action to protect the environment.