earth-hour 的英语阅读?
X 综合填空
( be earth turn energy take a difference country )
earth-hour started in Sydney on march 31,2007 .more than 2.2million homes and businesses( )off their lights for an hour.( )year later,on March 29,earth hour 2008 became a global activity and ( )supported by 50 million people from thirty-five( ) this year,on March28,over2100cities in eight countries ( )part in it .and( )Hour came to china.Theactivity aims to save ( )and improve climate.We may have ( )ways to spend the hour.Come on!Join us in Earth Hour 2010!