Inmanybigcitiesoftheworld,theoveruseofcarsisthoughttobethemajorcauseofairpollution.Whatwillcarsbel___1__inthefuture?Someexpertsthinkthattoday’scarsintroubleb__2____theyusetoomuchpetrol(汽油).Theysaythecar

　　Inmanybigcitiesoftheworld,theoveruseofcarsisthoughttobethemajorcauseofairpollution.Whatwillcarsbel___1__inthefuture?

　　Someexpertsthinkthattoday’scarsintroubleb__2____theyusetoomuchpetrol(汽油).Theysaythecarsofthefuturewillbemuchsmaller.Thecaroftomorrowwillbem___3___withoutamotororairconditioning.Itwillhavenoradioandnolights.Tomorrow’scarwillbeano___4____aircarwithnodoorsorwindows.Itneedn’thaveapollutioncontrolsystembecauseitw____5___usepetrol.Infact,thisnewcarwillbepushedbythedriver’sfeet.Veryfewpeoplewillbeilledinaccidents,becausethetops___6___willbefivemilesperhour.However,wearealsowarnednottoaskforprettyc___7___.Becausethecarswillcomeingreyonly.

　　Othercarexpertsdonotholdthesameidea.Theyares___8___thatthefuturewillbehappier.TheythinkthatallourproblemswillsoonbesolvedbycarcompanieswiththeproductionoftheSupercar.Tomorrow’scarwillbebigger,fasterandmorecomfortablethanb___9____.Thesupercarwillhavefourrooms,TVs,runningwater,heat,airconditioningandmaybeaswimmingpool.Largefamilieswilltravelonl___10____tripscomfortably.Ifpetrolisinshortsupply,thesupercarwillrunonwater.