Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Windmills make energy by spinning their .
is the largest producer of hydroenergy, followed my Canada, Brasil and the USA.
People use for eating, heating, feeding animals and making ethanol - a biofuel.
Corn is called an seed.
In the past people used the energy of for grinding grain and getting flour.