假如你是Peter,你的朋友Tom 邀请你周末一起去野炊，但是你的日程已经排满。请根据提示写一封信，说明你不能去的理由。提示：have a picnic, at the weekend, have a piano lesson, on Sunday morning,play basketball,go to a party, go shopping,revise(复习) for the English test
Dear Tom,
Thanks for your invitation. I’m sorry. _______________________________________________
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Yours
Peter.