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