Dear Jack,   
    I am writing to invite you to my 15th birthday party on Saturday, December 14th. I will have a meal in a restaurant with a few friends and then we will have a party at my house. I would like you to come if you can. If you want to stay at my home for a night, please tell me. I will prepare it for you.
    The meal will begin at 7:00 pm. We will have the birthday party at my house at about 8:30 pm. My mother will make a birthday cake and some snacks for us. I think they must be delicious. I hear that you have some nice CDs. Could you please bring them to my party and enjoy the music with us?
    Hope you can come!
    Yours，
    Bob