将下列单词或词组填入空格。每空格限填一词或词组，每词或词组只能填一次。
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A. various B. walking C. settled D. simply E. awarded
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Free
energy is everywhere around us. There are many ways to make and collect energy
from{#blank#}1{#/blank#}sources(来源) like sun, wind,
water, etc. But people always make things difficult by not using these sources
of energy. In the last few years there have been a great number of new ideas
for generating(产生) energy. People suddenly realized
that everyday things can be a source of energy, such as riding a bike, running or
just{#blank#}2{#/blank#}, etc. But, is there anything else that
can be used for collecting energy? We{#blank#}3{#/blank#}have to change our way of thinking if we
want to change the world.
So
comes the idea of solar( 太阳能) roadways. Are they the road of future? Why don't we use them for
collecting energy?
The
US Department of Transportation{#blank#}4{#/blank#}$100,000 to Solar Roadways to build the
first ever Solar Road.
