选词填空
schoolcarseasyairexercise
Manypeopleintheworldridebikeseveryday.Therearemorebikesthan_____intheworldtoday.AlotofChinesepeopleridebikestogotoworkor_____.Bikesaremuchcheaperthancars.Anditis_____forpeopletolearntoride.Bikesarealsousedfor_____.Ithelpsustokeepfit.Ifeachfamilyhasacar,itwillusealotofenergyandpollutethe_____.Soletusridebikes.
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