5、keyto_____yourresult.A.whether;improvingB.that;improvingC.whether;improveD.that;improve29.Wedon’tneedtodoextraworkthisevening.Theday’sworkwasalmost____now.A.attheendB.atanendC.atoneendD.intheend30.____ofthelandinthatcountry______coveredwithtreesandgrass.A.Twofifth;is B