Dear Tom:
I am afraid I cannot go to your birthday party this Sunday, because my parents went on business and they are coming back next month. Unluckily, my grandmother is ill in bed and I have to take care of her. Beside, the English test is coming soon, so I need to prepare for it. I am truly sorry but I am afraid I cannot go to your birthday party.
I hope you will have a good time on your birthday party.
Yours,
Li Ping
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