Dear Ms. Smith,
I'm Li Hua, Chairman of the Student Union of Yucai Middle School, which is close to your university. I'm writing to invite you to be a judge at our English speech contest to be held in our school on June 15. It will start at 2:00 pm and last for about three hours. Ten students will deliver their speeches on the given topic "Man and Nature". It’s my honor if you can accept our invitation. Please call me at 123456 if you have any question.
I am looking forward to your reply. With best wishes.
Yours，
Li Hua
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