1Itisnecessaryforthe的精選

問題詳情：根據句意及漢語提示完成單詞。1.Itisnecessaryforthemtoreceivetrainingbeforedoingthis______（任務）.eisa         (瞎的)boycrossingthestreet. Let’sgoandhelphim.3.Iusedtobeafraidofstayingina...