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Earth Hour started in Sydney on March 31st, 2007. It calls on families and buildings to turn off th...

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is started  was started  has started  started  
An hour earlier   If we start an hour earlier   Starting an hour earlier   Started an hour earlier  
to hold    being held    to be held    held  
more and more citizens were eager to watch operas  a committee decided to hold an important meeting in Sydney  Sydney became more and more civilized  more and more citizens became dissatisfied with the vacancy of an art center  

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