任务型阅读13请认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。注意：每个空格只填1个单词。请将答案写在答题卡上相应题号的横线上。Ambitionisanecessaryqualityinlife.Itistheforcewhichdrivesusontousewhatevertalentwehavegot.Ifwehaven’tgotsomedegreeofambition,thesetalentswillnotbeusedforourownandother’sbenefit.Wemustcontinuallywanttobebetterthanweare.Withoutambitionwearejustjellyfishthatflopthroughlife.Weonlyreacttoevents;wedon’ttrytocontrolthem.Ambition,however,canhaveseveraldefects.Firstofallitcanbeunrealistic.Wemaynotbeabletoseethelimitsofourownabilities,sowedoambitiousthingsthatarecompletelybeyondus.Ourcareermasterscanseeourgoodqualitiesandourlimitationsobjectively.Theymaytellusthatwehaven’ttheabilitytodealwithpeopleandwouldmakegoodbusinessmen.Werefusetotaketheirevaluation.Wekeepontrying.Manyyearsandmanydisappointmentslaterweareforcedtoaccepttheirjudgment.Butwhatawasteoftimeourill-foundedambitionhascausedus!Secondly,ourambitioncanbetooconcentrated.Wedevoteourattentiontoonenarrowaim,suchasgettingdistinctionsinoursciencesubjects.Everythingthatmaydrawusawayfromthisaimiscutoutofourlives.Intheendwegetourdistinctions.Butwhatdamagewehavecausedourselvesintheprocess!Weareisolatedbeingswhoonlycareaboutaparticularexamination.Andweprobablywon’tmakegoodscientists.Welackthebreadthofviewnecessaryforsuccessinhigherstudies.Thirdly,ourambitioncanbelimitedtolifelessobjectives.Wewanttogainmoney,orpower,ormembershipofsomecircles.Personswhofeelinferiortrytomakeupbyseekingtherespectofothersthroughpossessionsoftheseartificialsignsofworth.Fourthly,ourambitionmaybeself-centered.Insteadofdirectingsomeofourambitiontowardscommunityimprovementwemayexploitmembersofthecommunityintheinterestsofself-advancements.Inlaterlifewemaybeambitiousforthesuccessofourchildrenbutweregardthissuccessasonlyafurthermarkofourownsuccess.Ambitionisnecessaryinthelivesofindividuals---necessaryfortheirownimprovementandfortheimprovementofthecommunityinwhichtheylive.But,likeallblindforces,itmustbedirectedifitisnottocausedisaster.Itmustbetightlycontrolledbytheheadand