书面表达。
根据提示写一封60-80字的信。
Tom 邀请Li Ping 参加他这周日的生日宴会，但Li Ping的父母出差要到下个月回来，奶奶又卧病在床，需要人照顾。
再说英语考试即将来临，因此，无法前去参加生日宴会。Li Ping感到很抱歉，只好写信辞谢。
Dear Tom,
Thank you very much for inviting me to your birthday party. I'd love to go but I can't. My parents
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Dear Tom,
Thank you very much for inviting me to your birthday party. I'd love to go，but I can't. My parents are
out on business. They are coming back next month. And now I have to look after my grandma because she
is ill in bed. And I also need to study for my coming English exam. I'm very sorry but I can't go to your party.
Thank you for asking me. I hope you can have a good time.
From Li Ping
(答案不唯一)