5、roblemforoveranhourwithoutanyresult,____allatoncethesolutionflashedacrossmymind.A.whileB.when C.then D.as7.Can’twejustliveintoday,_______theworriesoftomorrowortheregretsofthepast?A.freefromB.awareofC.sureofD.tiredfrom8.Asisnatural,amanasoldashe____beveryforgetful. A.