根据提供的信息和语言素材设计教学方案，用英文作答。
设计任务：请阅读下面学生信息和语言素材．设计20分钟的英语写作教学方案。
该方案没有固定格式，但须包含下列要点：
· teaching objectives
· teaching contents
· key and difficult points
· major steps and time allocation
· activities and justifications
教学时间：20分钟
学生概况：某城镇普通中学初中二年级(八年级)学生，班级人数40人，多数学生已经达到《义务教育英语课程标准(2011年版)》三级水平。学生课堂参与积极性一般。
语言素材：
3a Read the three notes. Match each note with the correct situation.
_______ Thank-you note for a girl.
_______Thank-you note for a party.
_______ Thank-you note for help.
Note 1
Dear Kim,
Sometimes it isn′t easy being the new kid at school, but I had a wonderful time on Saturday night. Thank you so much for inviting me. I didn′t know some of the girls, but they were all really friendly to me. And the video you showed was really funny. I feel like part of the group now.
Maria
Note 2
Dear Ton,
Thanks for showing me the school last week. I was having a hard time finding it until  you came along. And I enjoyed meeting Carlos. He′s really good at math, isn′t he? He said he′d help me with my math project. Friends like you make it a lot easier to get along in a new place.
Bill
Note 3
Dear Aleen,
Thanks for the tickets for next week′ s game. I′ m sorry you and your father can′t go, but I′m really happy to have the tickets. I′ m going to ask my cousin, Tommy, to go with me. I′ ll think of you as we watch the Black Socks win the game. (I hope!)
John
3b Fill in the blanks in this thank-you note.
Dear Sarah, ________ for inviting me to your house on Friday. I really ________ meeting your family. And your baby sister is really ________. I had a ________ time. I′m ________ . I had to leave early, but I had a family dinner. My grandfather was having his 90th birthday party!
Yours sincerely,
Maria