Theearthisourhome.Wemusttakecareofit.Lifetodayiseasierthanitwas__1__yearsagobutithasbroughtsomenewproblems.Oneofthebiggestproblemsispollution.Wecanseeitsmellitdrinkitandevenhearit.Manhaspoll

　　Theearthisourhome.Wemusttakecareofit.Lifetodayiseasierthanitwas__1__yearsagobutithasbroughtsomenewproblems.Oneofthebiggestproblemsispollution.Wecanseeitsmellitdrinkitandevenhearit.

　　Manhaspollutedthe__2__.Themorepeoplethemorepollution.Manyyearsagotheproblemwasnotsoseriousbecausetherewerenotso__3__people.Whenthelandwasuseduportheriverwasnotcleaninaplacemanwentto__4__place.Nowmanisslowlypollutingthewholeworld.

　　__5__pollutionisstillthemostseriousit’sbadfor__6__thingsintheworld.Manycountriesdon’tletpeopleburn__7__forairinthehousesandfactoriesinthecity.PollutionbySO2isnowthemostdangerouskindofairpollution.It’scausedbyheavytraffic.Peoplesayit’s__8__toridebikes.Whenyouareridingthereisnopollution.Butevenindevelopedcountriesmostpeopledon’tgotoworkbybike.It’snotbecausebikesareexpensiveorpeoplearetirediftheyridetowork.It’sbecausethenumberofcarsontheroadsbecomeslarger.Somorepeople__9__theirbikesandgotoworkbycarthenthingsaregettingworseandworse.Weshouldhavespecialroadsonlyforbikesandmakeit__10__difficultandexpensivefordriverstotaketheircarsintothecitythattheywillgobacktousingtheirbikes.

　　（ ）1.A.hundred B.hundredsof C.hundredof D.hundreds

　　（ ）2.A.moon B.star C.earth D.sun

　　（ ）3.A.lot B.little C.many D.much

　　（ ）4.A.others B.theothers C.theother D.another

　　（ ）5.A.Air B.Food C.Water D.Noise

　　（ ）6.A.life B.live C.living D.lives

　　（ ）7.A.somethingbadB.badsomethingC.somethinggoodD.goodsomething

　　（ ）8.A.least B.best C.most D.worst

　　（ ）9.A.puton B.lookat C.putaway D.lookup

　　（ ）10.A.suite B.such C.very D.so