名词性从句练习23.24.25.26.27.Facedwithtroubleordifficulty,apersontakes________helpthatisavailable.A.whateverB.wheneverC.whereverD.however28.Thefacthasworriedmanyscientists________theearthisbecomingwarmerandwarmertheseyears.A.whatB.whichC.thatD.though29.—Doyouknowher?—No.HernameringsabellbutIcan’tremember________Ireaditbefore.A.whereB.whatC.thatD.if30.________therearelivingcreaturesintheouterspaceasthoseonEarthhasn’tbeenproveduntilnow.A.HowB.WhenC.WhereD.Whether31.—Heiseagertotrysomethinghehasnevertriedbefore.—Oh,Isee.That’s________he’sdifferentfromothers.A.whenB.whereC.howD.what32.Thepaintingissovaluablethatitisdifficulttocalculate________itspricewouldbe.A.thatB.whichC.whatD./33.Actually,anyonecanbe_______hewantstobe,adoctor,ateacher,alawyer,ascientistoramanagersolongashesetshismindonit.A.whoB.whoeverC.whomeverD.whatever34.SorryI’msolate,butyoucannotimagine________greattroubleItooktofindyourhouse.A.whatB.howC.whichD.why35.ProfessorBackmantookupscientificresearchfordecades,andthisis________hedevotedallhislifeto.A.whichB.whatC.whereD.how36.Heexpressedahope_____hewouldvisitChinaagainthenextyear,andthiswastheveryhope_____hewouldexpressassoonashearrivedinthecountry.A.That;thatB.Which;whichC.That;whichD.Which;that37.KEYS:1-5CBDCB6-10CADAD11-15CAACB16-20CABBC21-25ACBDC26-30DACAD31-35BCDAB36-40ABDAB