请你根据下面提示和要求，用英语写一封感谢信。

　　You borrowed from Mary a travel guide-book which you are now returning. Write her a letter of about 100 words thanking her for having lent it to you and telling her how useful you found it.

Hints:

　　You have kept this book for more than six months.

　　You would have been lost for many times if it had not been for the guide-book.

　　Your name is Sally.

　　The date of your letter is July 6, 1997

网络已成为日常生活中必不可少的工具，给我们带来了很大的便利，但也有很多不利，请你根据下列提示和要求就网络的利和弊谈一下自己的看法。词数100左右。短文必须包括以下内容要点：

参考词汇：对……上瘾be addicted to；影响affect

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

目前，越来越多的中学生利用周末上各种各样的培训班或请家教。对于这一现象，存在两种不同观点：

请您根据以上提示，以Is a Training Class of Family Teacher Necessary ?为题，写一篇120 词左右的短文，反映表中内容，并简要阐述自己的观点。文章开头已给出， 不计入总字数。

要求：层次清晰，连贯流畅；表达灵活，不要逐字逐句翻译。

参考词汇：巩固strengthen；

Is a Training Class or Family Teacher Necessary?

More and more middle school students are going to all kinds of training classes or having family teachers at the weekend. There are two different viewpoints about it.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

目前，越来越多的中学生利用周末上各种各样的培训班或请家教。对于这一现象，存在两种不同观点：

请您根据以上提示，以Are Training Classes or tutors Necessary ?为题，写一篇120 词左右的短文，反映表中内容，并简要阐述自己的观点。文章开头已给出，不计入总字数。

参考词汇：家庭教师：tutor 要求：层次清晰，连贯流畅；表达灵活，不要逐字逐句翻译。