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完型填空
Earth Hour(地球一小时)is a global event organized by World Wildlife Fund(WWF)and it is held on the last Saturday of March every year．It asks people to 1 their lights and other electrical appliances(电器)like computers for one hour．In this way, people can pay 2 attention to the climate(气候)change and know that it's important to save the earth．
Earth Hour first 3 in Sydney in 2007．More cities around the world followed Sydney's lead in 2008． 4 March 28, 2009, 88 countries and more than 4,000 cities joined Earth Hour．From 8：30 p．m．to 9：30 p．m．, Beijing, Dalian, Hangzhou, Hong Kong and many 5 cities in China took the action, too． 6 shops closed and people used candles at home．The UN said that it 7 save the energy(能量)．
The world seems to be a dark world 8 the lights are turned off．However, people are trying to do something to save the 9 in such beautiful “dark moment”．This year, WWF encourages people to make a small change for the environment every day．Now, 10 you join us?
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