根据短文内容和所给单词的首字母提示，写出短文中所缺的单词，使短文完整、合乎情景。请写出完整的单词。 Earth Hour started in Sydney on March 31, 2007. M小题1:   than two million homes and Businesses turned off their lights for an hour. A year 1 小题2:   , 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 t 小题3:   part in it, and Earth Hour came to China.  The purpose of the activity is to save energy and i 小题4: climate. Earth Hour has brought about some new c小题5: to our lives. We may have different ways to spend the hour. For example, we can go to school on foot or b小题6: bike, plant more trees, use water more than once, never leave the lights o小题7: when we are not at home. Try to make full use of paper by using b 小题8: sides. Earth Hour is a call for us to work together for a bright f 小题9:  It is also a message of hope and action.  Everyone can make a difference.  The improvement of our environment n 小题10: everyone's efforts. Come on! Join us in Earth Hour 2010! More