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问题详情：Todayroller-skatingiseasyandfunny.Butalongtimeago,itwasn'teasyatall.Before1760,theideaof36.________（skate）didn'texist.ThatwaschangedbecauseofamannamedJosephMerlin.Merlin'sworkwasmakingmusical...

问题详情： Todayroller-skatingiseasyandfunny.Butalongtimeago,itwasn'teasyatall.Before1760,theideaof61.________（skate）didn'texist.Thatwaschangedbecause62._______amannamedJosephMerlin.Merlin'sworkwasmak...