71. We are looking for a cheap, clean, effective source of power that doesn’t cause pollution or waste natural resources
72. At present, most of our electricity come from the use the coal, gas, oil or nuclear power
73. This power could be provided by the sun
74. One percent of the solar energy reaches to the earth is enough to provide the power for the total population
75. Many countries have already been using solar energy
76. Solar panels are placed on the roof of a house and the sun's energy is used to heat water
77. The energy can be stored a number of days
78. On cloudy days, you can use solar energy too
79. Viet Nam can be an advanced technology in solar energy
80. Cars will use solar energy instead of gas by the year 2030
