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

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.

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Best wishes!

Yours sincerely,

Li Hua

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 chance.Is 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