1. mr jones.... and told them to protect themselves from germs

2. nam said that the enviroment was severely ( khắc nghiệt ) affected by the pollution 

3. mai said that the burning of the fossil fuels led to air pollution

4. peter said that intensive insecticide ( thuốc trừ sâu ) and pesticide sprayed in agriculture made the soil contaminated 

5. nam said that it was confusing because there were too many web pages .....

6. scientists said that air pollution was one of the causes...

7. nam said that pollution was one of the problems in his neighborhood

8. the editor said that more people were aware of ....

9. the students told the teacher that they were discussing the protection of ....

10. nam's father told him to use the ...that he needed