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Aftertenyearsspenttrying-----tobecomethenumber-onewestcoastserviceprovider,thecorporationfinallysucceeded.
C
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Ms.Hartfieldwillmakeanexcellentexecutivebecause,whenconfrontedwithaproblem,sheknows-----whatcourseofactiontotake.
Thegovernmentagencylookscontroloftheoilindustryinadesperateattemptto-----thewildlyfluctuatingmarketprices.
Aninvestigationbythecommitteeuncovered-----instancesinwhichtheinstitution’sresourceshadbeenmisused.
Manyoilcompaniesarenowmakingalternativeenergy-----inanefforttoremaincompetitiveinfutureenergymarkets.
Ms.Arroyasaysthatwhenworkshop-----beginstoslowdown,itmaybetimetohiremoreworkers.
当（）时，函数为无穷小量
可微是其在该点偏导数存在的