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1. …………….. is environmentally friendly.
2. How can I avoid breathing …………….. from cars while cycling in the city?
3. A lot of …………….. is dumped into this river.
4. …………… is very harmful to the environment.
5. Many ……………… are in danger of dying out.
6. Forest fires cause many animals to lose their ……………. .
7. Chemicals cause ……………….. .