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Earth Hour started in Sydney on March 31, 2007. (1)M           than two million homes and Businesses
turned off their lights for an hour. A year (2)1           , in 2008, Earth Hour became the world's activity and
was supported by millions of people from thirty-five countries. In 2009, over two thousand cities in the
world (3)t           part in it, and Earth Hour came to China. The purpose of the activity is to save energy and
(4)i            climate. Earth Hour has brought about some new (5)c           to our lives.
We may have different ways to spend the hour. For example, we can go to school on foot or (6)b          
bike, plant more trees, use water more than once, never leave the lights (7)o           when we are not at home.
Try to make full use of paper by using (8)b           sides. Earth Hour is a call for us to work together for a
bright (9)f           . It is also a message of hope and action. Everyone can make a difference. The improvement
of our environment (10)n           everyone's efforts. Come on! Join us in Earth Hour 2010!

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