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(31)Ballpointpenshavemadelifeeasierformillionsofpeople.Atonetimeschoolsdidnotliketheirstudentstowritewithpen.Perhapsitwas16______penscanleakanditiseasytospilltheink.And17__ishardtowriteonthinorcheappaperwiththem.16.根据前后句的因果关系可知填because引导原因从句。17.作形式主语替代后面的不定式。becauseitLadislaoBiro18_______(work)foranewspaperinBudapest.Hespentalldayathisdesk.Dayinanddayout,hecorrectedpagesofthin,cheappaper19____apenandink.Heoftenhadtostoptofillhispenanditdidnotwrite20____(good)onthethinpaper.18.由上下文可知用一般过去时。19.介词with这里意为“用”。20.副词作状语,修饰write。workedwithwellHeandhisbrotherGeorgebegansomeexperiments.Theywantedapen21___________didnotleak,withinkthatdidnotspill.Whynotusealittleball22___theend?TwoEnglishmen,HenryMartinandFrederickMiles,liked23___idea.21.引导定语从句修饰前面的pen。22.根据搭配,attheend“在末端”。23.指代上文提到的想法。that/whichattheItwasthetimeoftheSecondWorldWar.TheAirForceneededanon-leak,non-spillpenforthemen24_______(write)withonplanes.MartinandMilesmade25____soldmanythousandsofBiro“writing-sticks”totheAirForce.24.不定式作补语。25.前后动词为先后关系,故填and。towriteand(32)SupposeyouaregoingtoBoston,andyouhavenevervisitedthecitybefore.Ifsomeonetellsyouabouttheinterestingplacesinthecity,youbegintogetsomeideas16___whatyouwillsee.Butdon’thave17___clearideaofwheretheseplacesareorofhowtofindthem.16.因idea后接of说明idea的内容。17.不定冠词表示“一个”。ofaHowever,18__someonehasamapofthecityandshowsyouthemainroadsandbuildings,youmaysay,“Oh,nowIsee.Icanfindmywaywithnotroubleatall.”19________(work)atmathissomewhatliketryingtofindyourwaytoanewcity.18.根据前后句的条件关系可知填if引导条件从句。19.动名词作主语。ifWorkingPerhapsthewordsmaytellyousome20___________(inform)andyouhavethoughtitover,21____youcan’tseeanyclearroadtotheanswers.Maybe22____needtohaveakindofmapofthemainroadsinmathstohelpyoufindyourway.20.名词作宾语。21.前后为转折关系,故填but。22.根据句中的tohelpyou可知。informationbutyouExplorewhatlies23__maths,andtryyourbesttofindthemainroads.They24________(lead)youtotheanswer.Ifyoucanfindthe“map”,themathsproblemswill25__________(work)outeasily.23.介词in此处意为“在……里面”。24.由上下文可知用一般将来时。25.由主语可知用被动语态。inwillleadbeworked(33)Thecomputerplaysanimportantpartinoureverydaylife.Itisoneofthegreat16_________(invent)intheworldinthetwentiethcentury.Itworksforusnotonlyathome,inoffices,inbigshops,butalsoatschools.Todayitisused17__manyways.Itreallybringstheworldlargewealth18___happiness.16.名词作表语,根据句中的oneof可知用复数。17.根据后面的ways可知填in。18.前后为并列关系,故填and。inventionsinand19____firstcomputerintheworld20________(call)Enid.ItwasbuiltinAmericain1946.Itwaslargeandheavy.Sinceitwasborn,it21__________________(develop)veryfast.Untilnowithasgonethroughfourperiodsandchangedalot.19.定冠词的基本用法,序数词前用the表顺序。20.由主语可知用被动。21.根据前面的since短语可知。ThewascalledhasbeendevelopingThere’remanykindsofcomputers.Computersaregettingsmallerandsmallerandcomputingfasterandfaster.So22____arebecomingmoreandmorehelpful.Thecomputercandomostofthethingsforpeople.22.指代前面的computers。theyItcanhelpus23________(know)abouttherealworldmorequickly,tolearn24_____wewanttolearnandtothinkforourselves.25___astudentinthetwenty-firstcentury,youmustworkhardatit.23.不定式作us的补语,后面并列的不定式有to,所以这里也不省略to。toknowwhatAs24.引导宾语从句,作从句的宾语。25.介词as此处意为“作为”。(34)Thecomputerisfast,andnevermakesamistake,whilepeoplearetooslow,andfullofmistakessometimes.That’s16____peopleoftensaywhentheytalkaboutcomputers.Foroveraquarterofacentury,scientists17_______________(make)betterandbettercomputers.16.引导表语从句,作从句的宾语。17.根据句首的时间状语可知用完成进行时态。whathavebeenmakingNowacomputercandoalotofeverydayjobswonderfully.18__iswidelyusedinfactories,hospitals,postofficesandairports.Acomputercanreport,decideandcontrolinalmosteveryfield.Manycomputerscientistsarethinkingofmakingthecomputer“think”likeaman.19___thehelpofaperson,acomputercandrawpictures,writemusic,talkwithpeople,playchess,recognizevoices,translatelanguagesandsoon.18.指代前面的acomputer。19.固定搭配,withthehelpof“在……的帮助下”。WithItPerhapscomputerswilloneday20_____(real)thinkandfeel.Doyouthinkthepeoplewillbeafraid21_____theyfindthatthecomputeristooclever22_____(listen)toandservethepeople?20.副词作状语修饰动词think和feel。21.根据前后句的时间关系可知填when引导时间从句。reallywhentolisten22.固定搭配,too...todo“太……而不能”。No,peoplewillmake23_____(good)useofthecomputersinthefuture.Manisalways24___masterofthecomputer.Thecomputerworksonlywiththehelpofman.Itcannottaketheplace25__man.23.隐含比较级,根据句末的inthefuture推出。24.有表示限制的介词短语ofthecomputer修饰,表示特指。bettertheof25.固定搭配,taketheplaceof“代替”。(35)Lifeinthe21stcenturywillbeverydifferent.Manychangeswilltakeplace,butwhatwillthechangesbe?Thepopulation16__________(grow)fast.Therewillbemanypeopleintheworldandmostofthemwilllivelonger17____peopleinthe20thcentury.16.根据句意要用现在进行时。17.根据空前的longer可推出填than。isgrowingthanComputerswillbemuchsmallerandmoreusefulandtherewillbeatleastone18___everyhome.Andcomputerstudieswillbe19___oftheimportantsubjectsinschoolthen.Peoplewillwork20_____(few)hoursandtheywillhavemorefreetimeforsports,watchingTVandtraveling.18.因home前有限定词时前面要用in。19.根据句意及空后内容可知。20.根据morefreetime可推出。feweroneinTravelingwillbemucheasierandcheaper,21____manymorepeoplewillgotoothercountries22___holidays.Therewillbechangesinourfood,too.Maybenoonewilleatmeateveryday.In