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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