1. If we don't use fossil fuel effciently , we will run out of it soon.
2. Solar power will be used as th main source of enegyin many countries in the future.
3. Will many people attend this conference?
4. Our family will use the new type of bulb to save enegry.
5. People won't allowed to destroy rainforests any more.
6. The government wil put natural resources under protection.
7. Solar panels will be see in many parts of the world
8. My grandfather doesn't believe that electricty will generate by the wind.
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