IV. Fill in the blanks with proper words, then answer the following questions. power – effective – nuclear – advanced – pollution heat – stored – electricity – energy - panels Are you looking for a cheap, clean, (27) ________ source of power that doesn’t cause (28) ________ or waste natural resources? Look no further than solar (29) ________ from our Sun. At present, most of our (30) ________ comes from the use of coal and gas, oil or (31) ________ power. This power could be provided by the Sun. one percent of the solar energy that reaches the Earth is enough to provide (32) ________ for the total population. Many countries are already using solar energy. Solar (33) ________ are placed on the roofs of a house and the Sun’s energy is used to (34)_______ water. The energy can be (35) ________ for a number of days, so on cloudy days you can use solar energy, too. Sweden has an (36) ________ solar energy program. There, all buildings will be heated by solar energy and cars will use solar power instead of gas by the year 2015. 37. Is the solar energy an efficient source of power?  ………………………………………………………………………………………………. 38. Where are the solar panels placed?  …………………………………………………………………………………………………. 39. How long can the energy be stored?  …………………………………………………………………………………………………. 40. Is the solar energy used in Vietnam now?  ………………………………………………………………………………………………….