1. If people eat dirty food, they can be cancer.
2. If a factory didn't directly discharges a large volume of waste water into the Thi Vai River, the river wouldn't be polluted.
3. If thermal pollution takes places, the water temperature in streams, rivers, lakes and ocean will increase or decrease suddenly.
4. If farmers use polluted water to water their plants, people who eat these plants will become sick with diseases such as ....
5. If people live in a radioactive pollution area, they can be skin cancer.