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：
·teachingobjectives
·teachingcontents
·keyanddifficultpoints
·majorstepsandtimeallocation
·activitiesandjustifications
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：
3aReadthethreenotes.Matcheachnotewiththecorrectsituation.
_______Thank-younoteforagirl.
_______Thank-younoteforaparty.
_______Thank-younoteforhelp.
Note1
DearKim,
Sometimesitisn′teasybeingthenewkidatschool,butIhadawonderfultimeonSaturdaynight.Thankyousomuchforinvitingme.Ididn′tknowsomeofthegirls,buttheywereallreallyfriendlytome.Andthevideoyoushowedwasreallyfunny.Ifeellikepartofthegroupnow.
Maria
Note2
DearTon,
Thanksforshowingmetheschoollastweek.Iwashavingahardtimefindingituntilyoucamealong.AndIenjoyedmeetingCarlos.He′sreallygoodatmath,isn′the?Hesaidhe′dhelpmewithmymathproject.Friendslikeyoumakeitaloteasiertogetalonginanewplace.
Bill
Note3
DearAleen,
Thanksfortheticketsfornextweek′sgame.I′msorryyouandyourfathercan′tgo,butI′mreallyhappytohavethetickets.I′mgoingtoaskmycousin,Tommy,togowithme.I′llthinkofyouaswewatchtheBlackSockswinthegame.(Ihope!)
John
3bFillintheblanksinthisthank-younote.
DearSarah,________forinvitingmetoyourhouseonFriday.Ireally________meetingyourfamily.Andyourbabysisterisreally________.Ihada________time.I′m________.Ihadtoleaveearly,butIhadafamilydinner.Mygrandfatherwashavinghis90thbirthdayparty!
Yourssincerely,
Maria