问题详情：
假设你是新华中学高一年级的李华，你的英国网友Tom来信邀请你暑假到伦敦观光旅游，但你因故不能赴约。请根据以下要点用英语给他写一封电子邮件。
1.表示歉意；
2.解释原因；
3.另约时间。
注意：1.词数100左右；
2.不要逐条翻译，可适当增加细节，以使行文连贯；
3.信的开头和结尾已给出，但不计入总词。
Dear Tom,
Thank you for inviting me to go to sightseeing in London during summer holidays.
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
_______________________________________________________________
Best wishes!
Yours sincerely,
Li Hua
【回答】
Dear Tom,
Thank you for inviting me to go sightseeing in London during summer holidays.
It is much to my regret that I can not join you,because I will be fully occupied in preparing for New Terms' studies-Senior Two.I must do a lot of homework ,review different subjects and join in different after-class activities. What's more,my grandma is ill,so I must take care of her.I feel terribly sorry for missing the it possible for you and me to have a private meeting next time? If so,please don't hesitate to drop me a line about your preferable date.I do long for a happy journey with you.
Best wishes!
Yours sincerely,
Li Hua
知识点：提纲作文
题型：书面表达
