帮忙变下被动语态!
1.Wecleantheclassroom2.PeopledonotknowMarkTwainasagreatthinker.
3.TodaypeoplethinkitisoneofthegreatestbooksinAmericanliterature.
4.Hemadethekitewhenhewasalittleboy.5.Theydidnotchoosemethistime.
6.Theywillpianttreestomorrow7.Wewonnotallowyoutowatchwithourfans.
8.Jimhasfinishedthework9.Peolehaveusedpaperandprintingforages
10.WecankeepinformationonCD-ROMs11.Dofarmersgrowriceinspring
12.DidTomdefeatedyoulasttime13.WilltheyaskustoplayintheOlympicGames
14.Whenwilltheyholdthematch15.Hashepublishedthebookyet
16.Howcanyoufinishtheworkinsuchashorttime