你要多少单词啊？120？
这样的事情最好自己弄弄，参照的文章工具书也有
Dear Tom,
I am so sorry to tell you that I won`t be able to come with you for the trip to Beijing. Because I will have to take part in a speaking contest. can we fix another time?
Once again, I am so sorry and I wish you a pleasant time.
Yours Sincerely
Li Hua
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