情景：你的美国朋友Lucy给你寄来一本英语书。
任务：请你用英语给她写一封50左右的短信。内容包括：
      1 告诉她何时收到书的； 2 你认为这本书怎么样； 3 你目前正在忙什么；
4 询问她何时回再来中国。     请用下面格式：
Dear Lucy ,
  ……
                                                                    Li Yan
范文：
Dear Lucy ,
  Thank you for sending me the English book . I got it yesterday . I find it is very useful for me to study English . Now I’m enjoying the summer holiday like you . I spend most of the time studying my subjects . When are you coming to China next time ? I’m looking forward to seeing you again .
                                                                    Li Yan