Unit 4.mp3: Recent figures show that around 1 dollars' worth of energy is wasted in Hong Kong each year. There are, however, a few 2 things that we can do to save energy in our homes. Firstly a 3 energy saving can be made by regularly 4 the filters on air-conditioners. You can keep costs down by setting air-conditioners to 5 degrees C since every one degree decrease adds 6 to the amount of energy used. Make sure that all leaks are 7 immediately because even a small drip can waste up to 8 liters of water in a month. The temperature of refrigerators should be set to 9 degrees C because each degree lower than this adds 10 to the amount of energy consumed.