Electricity is a type of energy that was discovered over 100 years ago. One of the most common w{#blank#}1{#/blank#}  to make electricity is by changing other energy sources (来源), such as coal, and oil or solar, wind and falling water. You may not even realize that electricity is a huge part of your e{#blank#}2{#/blank#}  life. Basically, it keeps your home and school w{#blank#}3{#/blank#}  in winter and cool in summer. W{#blank#}4{#/blank#}  it, you would never be able to watch your favourite TV show or listen to your MP3 player. Have you ever i{#blank#}5{#/blank#} a world in which you can't turn on a light, a computer, or even use the phone? So electricity is important to us and we n{#blank#}6{#/blank#}  electricity. That's why it's time to rethink our relationship with this v{#blank#}7{#/blank#}  resource (资源) and think about h{#blank#}8{#/blank#}  we can do our part to use it wisely.