Ishouldbearinmindforevertheoldsaying,"Don'tjudgeabookbyitscover.",ofwhichIawaredinastorybetweenmeandaclassmate.XiaoLi,anewcomerinmyclass,wasonlyaboutonepointthreemetrestall.AndhewasthepersonIlookeddownuponduetotheappearance,onceIevenlaughedathim,"Youlookridiculous."However,IsoonrealizedthatIwaswrong.Butherespondedwithoutaword.Later,atthefestivalcelebratingparty,afterwhenIwasondutyforcleaningtheclassroom,hedidsomething,becauseIlefttheclassroomwiththegroundfullofgarbage.

　　ButIdidnotrealizedthatIhadtotallyforgottenmydutyuntilthenextdaywhenIenteredtheclassroom,astonished----theclassroomwassoclean!AndjustwhenIwaswonderingaboutthis,mydeskmatetoldmethatitwasXiaoLiwhocleanedtheclassroom.Allofasudden,afeelingofshamestrokeme.I'veneverthoughttahtXiaoLiwassokindaperson,whilemesobad.Itwasjustafterthisstory,Ihadkeptthesayinginmind,"Don'tjudgeapersonbyhisappearance.'

　　的确不贯,而且还有用词不当的地方.关于连贯的问题你对照一下,我在文中是加了一些词和句子以衔接的,在这里我就指出一些你用词上的不当之处：

　　1、表达这个同学的身高,不过high的,身高的表达是用tall.举个很简单的反例,当你表达一架飞机有xxhigh时（xx为高度）,你能区别出指的是飞机的高度还是它起飞后离地的高度呢?

　　2、庆祝节日的聚会不需要将首字母大写的,除非是特定的节日,比如“春节”(SpringFestival)、“国庆节”(NationalDay)等才用大写.

　　3、最后一句话,”Don’tjudgeapersonbyitsappearance.”对于人怎么可以用“it”?“it”是表达“它”,有表达“人”的时候会用“它”的吗?