请根据下列材料写一个120词左右的英语便条给Lily。 Your classmate Lily has invited you to take part in her birthday party, but unfortunately your mother is ill because of a bad cold, and you have to take care of her.

【参考答案】

便条是一种方便、简单传递信息的方式，适用于非正式的场合。因此我们在写便条时内容要注意简单明了，语言可以更口语化。可参考以......

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