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employ sacrifice overlook abuse
electricity from the energy of rivers can be produced oil and coal are expensive to extract and transport hydroelectric power has some advantages over coal and oil waterfalls can be constructed by engineers
adopt abuse advocate allocate
harnessing energy through chemistry our last source of power how water power is produced the amount of solar energy that can be utilized
come to power in power come into power been in power
lose power over has power over seize the power of come into power of
since after unless before
under discussion under control under consideration under way
a machine using solar energy efficiently has already been developed the sun is our final source of power man uses only a tiny part of the sun's energy the part of the sun's energy we use is used indirectly
Wind power Fossil fuels Solar power Water power
fixed to be fixed to fix fixing
fixed to be fixed to fix fixing
since after unless before
since after unless before