Well ,I think we must keep happy all the time ,smile is a symbol of happy .We all know that happpy can make people fit ,make people get out of trouble ,and also can change our minds .smile can make you friendly and people all want to make friends with you .and smile are like fire .They can make you warm .so if you get into trouble ,try to smile all the time ,and then you will find that courage is in your heart .
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