14.Our houses will use the sun or the wind ____ electricity. A.to have B.to do C.to make D.to give 15.In the future, cars might use energy from ____. * A.gas B.water C.oil D.power 16.Our dream house will be located ____ the sea. * A.on B.at C.in D.between 17.Don't ____ old things because perhaps you will need them later. * A.throw B.throw away C.throwing D.throwing away

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