lastfriday,wehadanlessonanditwasreallyunforgettablebecauseitwasthelastlessongivenbyourkindenglishteacher,mrtang.

　　whenmrtangslowlywentintotheclassroom,wecouldseeclearlythatitwashardforhimtoleaveusthoughhehadtaughtusforonlythreemonths.hesaidsomethingabouthimfutureplan,whichmovedusalldeeply.thenhestartedthelastlesson.

　　wealllistenedattentively(认真地)toeverywordhesaid.ifonlywehaddonelikethisbefore!(如果我们以前就这样该多好啊)thenaughtyboysunusuallybehavedwellinthislastlesson.

　　itwasobvious(明显的)thatallofushadthecommonfeelingthatwewouldn'tlethimgo.

　　thoughwedidn'twantourgoodteachertogo,itseemedtobetoolate.asthesayinggoes,"onlywhenwelosesomethingdowerealizethevalueofit."(这句你应该能理解)

　　atlast,withthebellringing,mrtanglookedatusallsoulfully(深情地)andexpressedwhathethought.hehopedthatwewouldmakeprogressinourstudyandbecomegoodcitizens(公民)insociety.