1. For a long time people have used water to power machines.
2. Solar panels are placed on the roof of a house and the sun’s energy is used to heat water.
3. We can use energy from the sun, the wind, and the water.
4. Many countries have already been using solar energy.
5. The earth’s fossil fuels are running out.
6. We are looking for a cheap, clean, effective source of energy that does not cause pollution or waste natural resources.
7. Recently wind has been used to generate electricity.
8. The sun supplies all the energy used to grow plants, to evaporate water for rain, and to maintainthe temperature of the planet.
9. At present,most of our electricity comes from the use of coal,and gas,oil and nuclear power.
10. Today water is mostly used to generate electricity,
11. This power could be provided by the sun.
12. If we are able to collect solar energy, we will be sure to have enough power.
13. Scientists are trying to find and use other alternative sources of energy.
14. One percent of the solar energy that reaches to the earth is enough to provide the power for the total population.
15. Viet Nam can be an advanced technology in solar energy.
16. The energy can be stored in a number of days.
17. Car will use solar energy instead of gas by the year 2030.
18. Energy from the wind has been used for centuries tp move ships, grind grain, pump water and to do other forms of work.
19. On cloudy days you can use solar energy too.
20. Almost all our energy comes from oil, coal, and natural gas. We call them fossil fuels.
