1. The dirty air made Nick sneezed so much
2. Food and blankets are given to homeless people by volunteers
3. If there are a lot of trees, the air will be clean
4. After most of people left, the volcano erupted
5. It there wasn't so much light in the city at night, we would see the stars clearly
6. The fish are dead due to the water is polluted
7. The environment is polluted because everyone are littering
8. Your answer : ___________________________________
