哪位高手帮我改这篇英语短文,一共10个错误
Inyourschoolbagsyouhavepencils,pens,arulerorsomebooks.Neitherofthesethingsgrowinthefield.theywereallmadeinfactoriesandinventedsomeone.Therehavenotalwayshadpencilsandpens,rulersandbooksThousandsyearsago,nooneknewaboutthesethings,Whoinventedthem?Wedoalwaysknow.Therehavebeenmuchthousandsofinventionsinthehumanhistory,Someoftheseinventionshaschangedtheworld,suchaspaper,printingandradio,andweknowtheinventors,Andwehaveforgottenmostoftheotherinventors.anexample,whoinventedtheclock,orthelocktothedoor?Wedonotknow
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