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Dear Sonia,

    I will have a party for my 13th birthday. Would you' like to come to my birthday party? It will be a wonderful party. You can listen to some pop music and you can see a big birthday cake. I think it's much bigger than your schoolbag. It is as big as a desk. Have you seen such a cake? The party will be special too. It's also a ball. You can dance to the nice music. But you have to take a partner(伙伴). The party will begin at 7:00 pm next Friday. Welcome to my home. You will enjoy yourself!

Yours,

Lily