----- Nội dung dịch tự động từ ảnh ----- Are you looking for a cheap, clean, effective (1) power that doesn't cause pollution or waste natural resources? Look no further than solar energy (2) 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 (3)_population. Many countries are already using solar energy. Solar panels are placed on the roofs of a house and the Sun's energy is used (4) of our Sun. water. The energy can be stored for a number of days; so on (5) 21. A. source B. resource C.resources D. way 22. А. in days you can use solar energy, too. I С. of B. from B. recent D. above D. enormous D. heated 23. A. all C.total 24. A. heat B. to heat C. heating 25. A. cloudy B. cloudless C.sunny D. beautiful