Решение:
- 1. pollution - fumes, trees - rubbish, recycle - rain, clean out
- 1. newspapers and cans 2. toxic
- 3. air, water and soil - 4. collect
- 5. acid - 6. plant
- 7. river - a pond
Ответ: 1. fumes, rubbish, rain, clean out; 1. newspapers, 2. toxic; 3. air, water and soil, 4. collect; 5. acid, 6. plant; 7. river.