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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    Jim邀请Lily参加他这周日的生日宴会，但是Uly 的父母出差要到下周才回来。爷 爷又卧病在床，需要人照顾，加上数学考试即将来临。因此，Lily无法前去参加生日宴会。Lily感到很抱歉，只好写信辞谢。根据中文提示写一封60-80词的信(出差on  business)  
Dear Jim,    
     Thank you very much for inviting me to your birthday party. I'd like to go but I can't. My  parents…
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                                                                                                                                                 Yours,
                                                                                                                                                    Lily

     根据提示写一封60-80词的信。
     假设你是Tom，Jim邀请你参加他这周日的生日宴会，但你的父母去上海要到下个月才回来，
奶奶又卧病在床，需要照顾，而且英语考试即将来临。因此，你无法前往参加生日宴会。于是，
你写信辞谢并表示歉意。信的开头和结尾已经给出。
Dear Jim,
     _________________________________________________________________________________
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                                                                                                                                         Yours, 
                                                                                                                                          Tom

       根据下面的提示写一封70词左右的信件。
       Tom邀请David参加他这周的生日会，但David的父母有事外出要到下个月回来，奶奶生病在床，
需要人照顾，而且英语考试即将来临，因此无法前去参加。他感到十分抱歉，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                      
                                                                                                                                                       
                                                                                                                                                       
                                                                                                                                              Yours
                                                                                                                                              David