必要时填上for
1.heisveryill.nooneisallowertoenter______hisroom
2.willyouenter____thisweek'scrosswordcompetieion
3.manyathleteshaveentered____theolymapicgamesthisyear
4.noonesawthethiefwhenheentered______thebuilding
5.ihaveentered_______theexaminationbutidon'twanttotakeit