Нужно сделать в пассивном залоге. . 1) dangerous materials contaminate the air we breathe. 2) people are developing tumour and leukemia. 3) chemical, biological and radioactive pollution affects flora and fauna. 4) radioactive pollution causes premature death.

1. The air we breathe is contaminated by dangerous materials.
2. Tumor and leukemia are being developed by people.
3. Flora and fauna are affected by chemical, biological and radioactive pollution
4. Premature detah is caused by radioactive pollution.