Imaginearoadcrossingwithoutthethree-waytrafficsignal.Carstrucksschoolbusesbicyclistsandstudentswalkingtoschoolwouldtrytorushthroughthecrossing61_______thesametime.Theirsafetywouldbeindanger.
ThankstoanAfricanAmerican62________(invent)namedGarrettAugustusMorganwehavethree-positiontrafficsignalsthathelpmakecrossingsmuch63________(safe).Mr.MorganwasborninKentuckyin1877.Heonlyreceivedsixyears’education.Asateenhelefthisfamily’sfarminsearchofbetter64___________(opportunity).LivinginCincinnatiOhiohecontinuedhisstudiesinEnglishgrammar.ThenhemovedontoCleveland65________heworkedasarepairmanforaclothingfactory.Hehadakeeninterestinsolvingproblems66________(meet)ineverydaylife.Laterhepatentedseveralinventions.Thethree-waytrafficsignalwasjustoneof67___________.Onedayhefeltverysadwhenhesawatrafficaccident.Tohelpreducetrafficaccidentsandsavepeople’sliveshe68__________(immediate)begantoworkontheinvention.Finallyitwas69______greatsuccesswhichsavedlivesthenand70________(be)stillsavinglivestoday.