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N. 4.15.6.1 7.8. 9.. 10. 11. 12 13. 14. 15. 16- 17. 18. 19. 20
v. Write the correct form or tense of the verbs in brackets.
1. Humans
(fuse) the power of moving water for more than 2,000 years.
2. I'll call you at 8 o'clock tonight. What
(you/do) then?
3. At present, global demand for energy_
(increase) rapidly.
4. Three years ago. we
9install) a solar water heating system on our roof
5. What
(happen) if non-renewable resources run out?
6. A small hydropower plant_
(build) on the river in ten years time..
52
7. If the electricity
(make)from wind turbines, it is green.
8. Burning fossil fuels
9. We decided
(emit) gases that are harmful to the environment.
(invest) our time and effort on this new research project
10. You should avoid
_(use) cars or motorbikes for short trips.
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