ACROSS
1. We are doing a…...on sources of energy now.
2. Alternative....of energy will be developed quickly.
3. What should the government do to ....................the use petrol?
4. Wind……will offer a great deal of energy in the future.
DOWN
1. My friends and I ride bicycles to school to reduce air……….
5. They put low…..light bulbs in the classroom.
6. My father prefers using……………………transport to protect the enviroment
7. When a source is used, it usually takes time to…………it
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