提示：Sonia邀请Henry 下周参观故宫(Palace Museum)，但Henry很忙，不能去。请根据Henry的安排给Sonia发一份电子邮件。

Henry's calendar:
Monday:study for the math test
Tuesday:go to the guitar lesson
Wednesday:do homework
Thursday:help my parents with housework
Friday:Susan's party

Dear Sonia ,

Thank you very much for inviting me to visit Palace Museum with you . I’d love to go but I can’t. ________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

                                                                 Yours,

                                                                 Henry