请阅读Tony从美国发来的电子邮件，以李华的名义写一篇80词左右的回复。文中不得出现真实的人名、校名与地名。
Hey Li Hua
How are you? I've been busy since I came back from China. Guess what! I'm learning Chinese very hard, but I find it really difficult to learn Chinese well. Please tell me the best way you think.
One more thing, I hear you have Mid-Autumn Festival in China. What's the date of the festival? How do you celebrate?
Tony
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