今天，T0m收到好朋友Betty的一封电子邮件，Betty邀请他明天去参加她的生日聚会。请根据下面的提示，帮Tom写一封电子邮件给Betty。

  1．谢谢她的邀请。

  2．很抱歉，不能去。

  3．母亲病了，得呆在家里照顾母亲。

  4．向她说声“生日快乐”。

  词数不少于70词。

1、Hi Betty,

  Thank you very much for your invitation I’m sorry I can’t go to your birthday party．My mother is ill．She has a bad headache and the doctor asks her to stay in bed for a few days．I have to stay at home to look after her．

  I’m really sorry．I’m visiting you after my mother feels better．Here I say“Happy birthday!”to you．

Yours，

                                                 Tom