第一个：

　　Ithoughtalotattendingthelectureaboutgratitude.ThefollowiswhatIwanttospeaktoyou.

　　Iwouldliketothankyouforallthehelpyougavemeduringthispastsemester.YouwerealwaysopatientwhenIaskedyouquestions.Youlistenedtothemcarefullyandexplainedeverythingsothoroughly.Youshowedmedifferentwaystopracticeandremembernewwordsandusage.IfeltsoencouragedandbecamemorecomfortableinspeakingEnglish.YoumadetheexcercisesointerestingthatIwasalwaysveryeagertoparticipateandpractice.MyEnglishhasimprovedsomuch.HowcouldIthankyouenough?!IcannotwaittotakeyourclassnextsemesterandkeepworkingonmyEnglish.

　　Lastwishbestwishes.

　　第二个可以改一下

　　Nowadays,quiteafewcollegestudentslackconciousnessofbeinggrateful.Theyturntotakesuchthingsforgranted,asparentssupportingthem,teachershelpingthem,andwaitersservingthem.Theyareevenmeantosay"Thankyou"toothers.Thisphenomenonhascausedgreatattentionfromthewholesociety.

　　Thefollowingreasonscanaccountforthelackofgratefulnessconciousness.Firstofall,unsoundfamilyeducationplaysanimportantrole.Manyparentsturntopaytoomuchattentiontochildren'sacademicperformance,butignoretheirvalueorientation.Moreover,schoolsdon'tinputenoughtimeandmoneyinmoraleducation.Besides,nowadays,collegestudentsgetsomuchlovethattheyareinsenstivetoothers'careandhelp.

　　Consideringtheseriousnessoftheproblem,itishightimetotakeeffectivemeasurestostrengthencollegestudentsconciousnessofbeinggrateful.First,parentsshouldimproveself-qualityandinfluencechildrenbytheirownbehaviors.Second,oursocietyandschoolsmustincreaseinputinmoraleducation,andtrytobuildtheatmosphereofbeinggrateful.Finally,wecollegestudentsshouldlearntoexpressourgratefulnesstopeoplearoundus,justbeginningfromthesimple"Thankyou".