【OneafternooninJanuaryin1998,SusanSharp,43,andher8-year-oldsonDavid,werewalkingacrossanicysquare,whenSusan'scane(手杖)slippedontheice.Herface1firstintothemud.David2hermother'sside,“Areyouallright,Mom？】

　　OneafternooninJanuaryin1998,SusanSharp,43,andher8-year-oldsonDavid,werewalkingacrossanicysquare,whenSusan'scane(手杖)slippedontheice.Herface 1 firstintothemud.David2 hermother'sside,“Areyouallright,Mom？”3,Susanpulledherselfup,“I'mokay,Honey,”shesaid.

　　Susanwasfallingmore4 sinceshehadtroublewalking.Everyinchoficewasa5 dangerforher.“IwishIcoulddosomething,”theboythought.David,too,washaving6 ofhisown.Theboyhadaspeechproblem,soatschoolhetalked7.

　　Oneday,David'steacherannounceda8 homework."Eachofyouisgoingtocomeupwithan9,"shesaid.Thiswasfor"INVENTAMERICA",anationalcompetitiontoencouragecreativityinchildren.

　　Anidea10 Davidoneevening.Ifonlyhismother'scanedidn'tslipontheice.“WhatifI11 yourcanetoanailcomingoutofthebottom”heaskedhismother.

　　“12 thesharpendwouldscratch(划破)floors,”Susansaid.

　　“No,Mom,I13 makeitlikeaball-pointpen.Youtakeyourhandoffthebuttonandthe14 returnsbackup.”Hourslaterthecanewasfinished.Davidandhisfather15 asSusanusedittowalk50feetabovethe16.HappilySusancriedout,“It17 !”

　　InJuly1999,Davidwas18 nationalwinnerforthe"INVENTAMERICA".Davidbegantomakepublicappearance.Thushewasforcedtocommunicate19.Today,Davidisnearlyfreeofhisspeechproblem,andhis20 isbecomingwellaccepted.

　　A.dropped

　　B.touched

　　C.lay

　　D.fell

　　A.rushedto

　　B.stoodby

　　C.lookedat

　　D.ranaround

　　A.Firmly

　　B.Easily

　　C.Shakily

　　D.Quickly

　　A.frequently

　　B.slowly

　　C.freely

　　D.heavily

　　A.hiding

　　B.possible

　　C.certainly

　　D.waiting

　　A.method

　　B.trouble

　　C.disease

　　D.hope

　　A.little

　　B.few

　　C.much

　　D.more

　　A.useful

　　B.strange

　　C.special

　　D.common

　　A.invention

　　B.appearance

　　C.experience

　　D.experiment

　　A.reminded

　　B.encouraged

　　C.hit

　　D.occurred