题目内容：

根据短文内容及首字母提示，填写所缺单词，使短文意思完整。每空限填一词。

Think about how you use artificial (人造的) light every day. In the morning, a light on your clock shows the time. When you use your computer, television, and a phone, their screens light up. Traffic lights tell you w  1. to stop and go when you drive. You turn on lights in your car and in your house at night. These are just some of the w2. you use artificial light. Now think a 3. living without artificial light. How different would your life be?

In the past, people use fire for light at night. Then from 3,000 BC, people started using candles. After that lamps (灯) were i 4., people used oil and gas to light the lamps. Finally, in 1879, Thomas Edison invented a safe and easy way to use the electric light bulb (电灯泡). His invention c5.our world.

Before the light bulb, it was so d6. at night that people could not do much work. Electric light changed that. Business grew. People could do more at night and they could do things during the day more e7.. If you look at a picture of our planet from space at night, you can see how the light bulb changed life on Earth.

We depend on electric light from energy sources (来源) like oil, gas, or coal. But those energy sources c8.pollution. One answer to this problem is to use a c9.source of energy, for example, solar power (太阳能). Scientists have found a way to catch the energy of the sun’s light and save i10. to use later. So now the sun can light our homes at night.