Officemannersmustbe_________________(observe)atalltimes.

Listentothepassageandsupplythemissingwordsorphrases. Answer the following two quetions based on what you have heard.  Asthecarindustrydevelops,trafficaccidentshavebecomeas(1).asthecommoncold,yettheircauseandcontrol(2)aseriousproblemthatisdifficulttosolve.(3)havelongrecognizedthatthisdiscouragingproblemhasnotablecauses. Attheveryleast,itisaproblemthat(4)threefactors:thedriver,the(5)andtheroadway.Ifalldriversexercisedgood(6)atalltimes,therewouldbefeweraccidents.Butthisisratherlikesayingthatifallpeoplewerehonest,therewouldbenocrime.(7)hashelpedtomakehighwaysmuchsafer.Butthetideofaccidentscontinuestorisebecauseof(8) andenormousincreaseinthenumberof(9)ontheroad.Attentionisnowturningincreasinglytothethirdfactoroftheaccident,thecaritself.Sincepeopleassumethataccidentsare(10),theywanttoknowhowcarscanbebuiltbettertoprotectthedrivers.