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Energy ____________________ does not have to be ____________________ . You don't ____________________ to buy a hydrongen - powered car , for ____________________ , or sit in a dark ____________________ every ____________________ . Instead , try to do several small ____________________ each day to ____________________ the amount of ____________________ you you use . These small things can ____________________ up to big savings on ____________________ energy bill , and they can be a big help to the ____________________ as well .