阅读短文，然后在下面的表格中完成内容提要，每空不超过3个单词。
New Energy in the Twenty-first Century
Energy from the wind
Wind is a kind of clean energy, and there is lots of it, but, if there's no wind, there is no wind energy.
Energy from the water
When water moves from a high place to a lower place, it can make electricity (电) without pollution.
However, people have to build dams (水坝) to use this energy, and building dams is very expensive.
Energy from the earth
There is heat in the rocks under the earth. Scientists use the heat to make geothermal (地热的) energy.
This kind of energy is cheap, but it is only possible in a few places in the world.
Energy from the sun
Solar panels (太阳电池板) on the roofs of houses can turn energy from the sun into electricity. Solar
power is clean and plentiful (丰富的), but when the weather is bad. It doesn't work.
                                  New Energy in Twenty-first Century

	Advantages	Disadvantages
Wind Energy	Clean.There is a lot.	It needs 1______.
Water Energy	2______	It is expensive.
Geothermal Energy	3______	only possible in a few places.
Solar Energy	Clean and plentiful.	It depends too much on 4______.

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