阅读填词。阅读短文，根据其内容图表中的空格里填入一个恰当的单词。
New Energy in 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 movers from a high place to a lower place, it can make electricity 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 is only possible in a few places in the world.
Energy from the sun.
Solar panels on the roofs of houses can turn energy from the sun into electricity. Solar power is clean and plentiful. But when the weather is bad, it doesn’t work.

New      in 21C	Adervantage	Disadervantages (缺点)
Wind energy	A kind of         energy	If there is no      ,there is no wind energy.
energy	Water movers can make electricity without	Building dams is not
Geothermal(地热的)energy	The   in the rocks under the earth can make energy.	Only   in a few places
Solar energy	Solar power is clean and	When the      is bad, it doesn’t work.