We reduced our electricity costs by installing ____ lightbulbs. An ____ teacher can motivate students to succeed. It’s difficult to see ____ heating becoming practical in cities that don’t get much sunshine. Unless electric cars become more ____, most people won’t be able to buy one. Students who can’t go to school are able to go online and study in a ____ classroom. The main advantage of using ____ technology is that it can change to suit different situations and needs. These ____ homes use computers to control the heating, security, and energy.

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