Điền từ thích hợp

điền từ thích hợp
 Are you looking for a cheap , clean , effective source of (1)………………..that doesn’t cause polution or waste natural recources .? look no further than solar energy from our sun . At present , most of our electricity comes from the use of coal , and gas , oil or (2)………………power . This power could be provided by the sun . One percent of the solar energy that reaches the Earth is enough to provide power for the total population .

      Many countries are  already using solar energy . Solar panels are placed on the roof of a house and the sun’s energy is used to (3)………..water . The energy can be stored for the number of days, so on cloudy days you can use (4)…….. energy too. Sweden has an advanced solar energy program . There all burn will be heated  by solar energy and (5)………….. will use solar power …(6)…………..of gas by the year 2015