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10 questions
__________ comes from the power created by flowing and falling water.
Wave energy
Hydroelectricity
__________ is the most popular renewable power source.
Hydropower
Wind energy
With no harmful emissions and powered by free fuel from the air, __________ seems like one of the perfect energy solution.
solar energy
wind energy
__________ has long been considered a good alternative to petrol which is made from oil and may soon run out.
Biofuel
Fossil fuel
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