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Everyday, in homes all over the world , people waste huge amout  of energy and water . Hong Kong is estimated to waste about $5 billion worth of energy a year. This is due to their bad habit (1) _________ is leaving lights, air-conditioners and televisions on when no one is in the room . Using too much water , or not (2) ____________ dripping taps, also contributes to the problem . Most people do not realize that saving energy in the home will actually (3) ___________ them money. If people use (4)________ energy , gas and electricity bills will become lower. Most of the ways we can use to decrease energy consumption in the home are very simple . The simplest is to turn (5) ___________ household appliances