2. Wind will be used as an _________________ friendly source of energy.                                 (environment)

3. There are many ways will be used to solve the problem of _________________.                   (pollute)

4. Solar power can be used to _________________ or cool our houses.                                       (hot)

5. _________________, fossil fuels are harmful to the environment.                                           (fortunate)

6. We should use them _________________ and try to find out alternative sources of power. (economy)

7. Solar energy is _________________, plentiful and clean.                                                         (renew)

8. I think that solar energy can be an _________________ source of energy in the near future. (alter)

9. We should reduce the use of _________________ at home.                                                     (electrical)

10. It’s a clean source of energy. Sailboats couldn’t move without this _________________.     (powerful)

11. Waves will be used as an _________________ friendly source of energy.                             (environment)

12. Limit car trips by relying on biking, walking, public _________________.                           (transport)

13. Solar power can be used to _________________ or cool our houses.                                     (hot)

14. Energy is used to _________________ a lot of electrical things.                                             (product)

15.There will be a _________________of energy in the near future.            (short