1. is when we make nature

dirty.

2. Air pollution is by smoke from

and cars.

3. Dirty air is for our bodies,

especially our lungs.

4.We need to clean the dirty air.

5.Water pollution is caused when

enter the lake and the .

6.Water pollution can cause fish to

and can our bodies, making us very

thick.

7. is caused when we throw

on to the ground.

8.To our environment, we

need to pollution.

9.People stop cutting down

and plant new trees.

10. Instead of throwing rubbish away, we

recycle it.

1. Pollution is when we make nature  dirty.

2. Air pollution is caused by smoke from factories and cars.

3. Dirty air is dangerous for our bodies,  especially our lungs.

4.We need trees to clean the dirty air.

5.Water pollution is caused when rubbish enter the lake and the sea.

6. Water pollution can cause fish to die and can poison our bodies, making us very  thick.

7. Land pollution is caused when we throw  rubbish on to the ground.  

8. To protect our environment, we  need to stop pollution.

9. People must stop cutting down  forests and plant new trees.

10. Instead of throwing rubbish away, we  should recycle it.

В самом задании не хватает еще одного слова. В 9 предложении, я предположу, что не хватает слова forests.