题目内容：

Frank邀请Ａlice参加他这周日的生日宴会，但Alice的父母不在家要到下个月回来，奶奶又卧病在床，需要人照顾。因此，无法前去参加生日宴会。Alice感到很抱歉，只好写信辞谢。

Dear Frank,

Thank you very much________________________________________________________

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I hope you can have a good time.

FromAlice