请高水平回答,英语完形填空题：MarkTwainwasaverycleverman.Hecouldthinkquickly,31hehadagoodsenseofhumour(幽默).Wedon'tknowifthesetwostoriesaretrue,buttheyareinterestinganyway.MarkTwainwenttoa32f

　　请高水平回答,英语完形填空题：

　　MarkTwainwasaverycleverman.Hecouldthinkquickly,31hehadagoodsenseofhumour(幽默).Wedon'tknowifthesetwostoriesaretrue,buttheyareinterestinganyway.

　　MarkTwainwenttoa32friendtoaskhimafavour.

　　"I'dliketo33abookfromyourlibrary."

　　"I'msorry,"34thefriend."Ineverpermitbookstobe35frommylibrary.Ifyouwanttoreadthebook,you36readithereinthelibrary.Youmaynottakeithome."

　　Afewdays37,thissamemanwantedtomow(割)hislawn(草坪).SohewenttoMarkTwain'shousetoborrowhislawnmower.

　　"I'm38,"saidTwain."Ineverpermitmylawnmowertobetakenfrommyhome.Ifyouwanttouseit,youmustuseithere."

　　39time,Twain'snephew(侄子)was40him.Onemorning,whenthey41wentdowntobreakfast,Twainsawthathisnephew'sshoesweredirty.

　　"Yourshoesarecovered42mud.Whydidn'tyoucleanthemlastnight?"heaskedtheboy.

　　"Ithoughtitwasuselesstocleanthemin43badweather,"thenephewreplied."Theywillonly44dirtyagaininashorttime."Twainthenpreparedhisbreakfast,buthemadenothingfortheboy.

　　"Whyisthere45breakfastforme?"thenephewasked.

　　"Ithoughtitwasuselessforyoutoeat,"saidTwain,"becauseyouwillonlygethungryagaininashorttime."

　　()31.A.soB.andC.butD.yet

　　()32.A.certainB.sureC.someD.his

　　()33.A.lendB.borrowC.getD.buy

　　()34.A.answeredB.repliedC.toldD.talked

　　()35.A.fetchedB.carriedC.broughtD.taken

　　()36.A.mustB.shouldC.oughttoD.may

　　()37.A.agoB.beforeC.laterD.past

　　()38.A.regretB.sorrowC.sorryD.happy

　　()39.A.NextB.ThenextC.TheotherD.Another

　　()40.A.seeingB.visitingC.callingD.droppingin

　　()41.A.allB.bothC.eitherD.neither

　　()42.A.withB.ofC.byD.in

　　()43.A.suchB.suchaC.soD.soa

　　()44.A.turnB.growC.comeD.get

　　()45.A.notB.noC.noneD.nothing

　　注：只要求回答第39个空,第43个空,并回答为什么选?其它为什么不行?

　　又注：请问为什么不选C.Theother，原文不是说Wedon'tknowifthesetwostoriesaretrue,buttheyareinterestinganyway.一共两故事是否真实吗？那其它一个不是theother吗？为什么不行呢？