内容大概是这样
Tom邀请Li Ping 参加他这周日的生日Party，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，因此无法参加生日Party。Li Ping感到很抱歉，只好写信辞谢。内容可适当发挥，70词左右
开头已给出：
Dear Tom,
Tank you very much for inviting me to yuor birthday party. I'd love to go but I can't . My parents....................
拜托大家啦，写两篇，最好附上中文，谢谢，麻烦大家叻
我的父母出差要到下个月回来，奶奶又卧病在床，需要人照顾。
并且英语考试即将来临，因此无法参加生日Party。对此我真的感到很抱歉，希望你能理解我。下次的生日Party我一定参加，提前祝你生日快乐！
Dear Tom,
Tank you very much for inviting me to yuor birthday party. I'd love to go but I can't .My parents travel to go to next month back, my grandmother also confined to bed, need people to take care of.
And the English exam is approaching, so unable to participate Birthday Party. I am really very sorry, hope you can understand me. Birthday Party next time I will participate in an early Happy birthday to you!