Dear Anna，

　　I'm writing to invite you to take part in an open­air concert to be held in the city square this Sunday and give a performance. The concert is aimed at raising money for Li Ming, a student in my school who is suffering from a terrible disease and whose parents are too poor to pay for medical bills. As a warm­hearted girl, you'll certainly be glad to give him a hand. And your participation will undoubtedly attract more people to attend the concert. I do hope you can make it. If the time isn't convenient for you, please let me know.

　　I'm looking forward to your reply.

　　Yours，

　　Li Hua