问题标题：
【根据上下文选择正确的词填空1.IamNo.()inmyclass.ButHelenisthe()one.(eight,eighth)2.Thereare()boysstandinginaline.The()oneisnBen.(twenty-first,twenty-one)3.Thereare()daysinaweek.AndweknowSaturdayisthe】
问题描述：
根据上下文选择正确的词填空
1.IamNo.()inmyclass.ButHelenisthe()one.(eight,eighth)
2.Thereare()boysstandinginaline.The()oneisnBen.(twenty-first,twenty-one)
3.Thereare()daysinaweek.AndweknowSaturdayisthe()ofaweek(seventh,seven)
刘宇蕾回答：
eight,eighth
twenty-onetwenty-first
sevenseventh
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