用所给单词的适当形式填空，未提供单词的根据上下文填入一个适当的词。
Theworld'sfirstbicyclewasinventedbya Frenchmanin1790.Sofarpeoplehavemadebicycles16over220
years.Once(―......就)peoplestartedmakingbikes17
didn'ttakelongforthemtowanttorace eachother.ThefirstrecordedbicycleracewasheldonMay31，1868inParis.The1.2kmracewaswonbyanEnglishmannamedJames Moore18awoodenbike.
Afterthatpeople'sinterest19bicycle racinggrewrapidly.Bicycleracesbecamemoreandmorepopular.Soitwas20( nature)thatbikeracingwasincludedasoneofthe21(event)inthefirst modernOlympicGames.
Duringthisperiodtrackcyclingbecamevery popular22intheUnitedStatesandEurope.Cyclingcompetitions(比赛)thatattracted(吸引)largenumbersofcrowds wereheldinvenuessuch23MadisonSquareGanh'i).
InEuroperoadracingattractedthe atlrnlionofcyclistsandsportsloversaswell，andit wasaroundthistimethatgrandandimpressivecity-to-cityraceswerestarted. The24(one)TourdeFrance(环法自行车赛）washeldin1903.It laterbecame25mostimportanIhicycleraceintheworld.
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