1)未及时回信的原因；
2)你假期的打算（如做兼职、旅行、做志愿者等）
注意：1)词数：120-150；
2)可适当增加细节，以使行文连贯。
How is everything going? I feel terribly sorry for missing the chance of answering your letter in time. You know, I've been preparing for the final exams these days, so I forgot to write back. In your letter, you asked me for my plans on summ
