Longagooperationusuallyhadtobedonewhilethesickmancouldfeeleverything.Thesickmanhadtobehelddownonatablebyforcewhilethedoctorsdidtheirbesttosavehim.Hecouldfeelallthepain
ifhislegorarmwasbeingcutoffandhisfearfulcriesfilledtheroomandtheheartsofthosewho
watched.
Soonafter1770JoseptPriestleydiscoveredagaswhichisnowcalled"laughinggas".Laughinggas
becameknowninAmerica.Youngmenandwomenwenttopartiestotryit.MostofthemspenttheirtimelaughingbutonemanatapartyHoraceWellsnoticedthatpeopledidn'tseemtofeelpainwhenthey
wereusingthisgas.Hedecidedtomakeanexperimentonhimself.Heaskedafriendtohelphim.
WellstooksomeofthegasandhisfriendpulledoutoneofWells'teeth.Wellsfeltnopainatall.
Ashedidn'tknowenoughaboutlaughinggashegaveamanlessgasthanheshouldhave.Theman
criedoutwithpain whenhistoothwasbeingpulledout.
Wellstriedagainbutthistimehegavetoomuchofthegasandthemandied.Wellsneverforgotthis
terribleevent.
1.Longago,whenthesickmanwasoperatedonhe______.
A.couldfeelnothing
B.couldnotwantanything
C.couldfeelallthepain
D.coulddoanything
2.Usingthelaughinggasthepeopledidnotseemto______.
A.beafraidofanything
B.feelpain
C.wanttogototheparties
D.be ill
3.Ifamantooklesslaughinggasthanheshouldhavewhenanoperationwentonhe______.
A.feltnothing
B.feltverycomfortable
C.stillfeltpain
D.woulddie
4.Onewhotooktoomuchofthelaughinggas______.
A.wouldlaughallthetime
B.wouldbeverycalm
C.wouldneverfeelpain
D.woulddie.
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