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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.

{#blank#}1{#/blank#} As a ________, you'd better not say a word.
{#blank#}2{#/blank#} We will go on a _______ in the mountain. Let's meet at the school gate.
{#blank#}3{#/blank#} Much of the land is ________ by forest.
{#blank#}4{#/blank#} On Friday afternoons, many students are ________ after a long week of classe5.
{#blank#}5{#/blank#} The ________ of the orange flowers is nice.

    People {#blank#}1{#/blank#}kites for at least two thousand years. Kites are fun to fly, but did you know there are also practical reasons to fly them? It {#blank#}2{#/blank#}that, in 1750, Benjamin Franklin flew a kite in a thunderstorm to verify that lightning was electricity. The Wrights brothers tested many of their aviation theories by flying early airplane designs as kites. This allowed them to experiment different wing shapes and controls from the ground before their first flight in 1903.

    No matter why you fly kites, {#blank#}3{#/blank#} attention to the weather for good kite-flying conditions. The wind should be between 5 and 25 miles per hour. It should be neither too calm nor too strong. Don't fly a kite when it {#blank#}4{#/blank#}. It's better {#blank#}5{#/blank#} an open space. Don't let your kite be eaten by a tree or bump into people, buildings or power lines.