（2015•广东佛山）阅读下面短文，掌握其大意，然后根据短文内容和首字母提示，在短文空白处填入适当的单词，使短文内容通顺、合理。

Electricity is a type of energy that was discovered over 100 years ago. One of the most common w____  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____  life. Basically, it keeps your home and school w____  in winter and cool in summer. W____  it, you would never be able to watch your favourite TV show or listen to your MP3 player. Have you ever i____ 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____  electricity. That's why it's time to rethink our relationship with this v____  resource (资源) and think about h____  we can do our part to use it wisely.

美国历史学家斯塔夫里阿涪斯指出：“正如整个世界感受史蒂芬孙的机车、富尔顿的汽船，加特林的机枪的影响一样，它也感受到《独立宣言》《人权和公民权宣言》和《共产党宣言》的影响．作者在这里要说明的是（　　）