1Itisnecessaryforthe的精选

问题详情：根据句意及汉语提示完成单词。1.Itisnecessaryforthemtoreceivetrainingbeforedoingthis______（任务）.eisa         (瞎的)boycrossingthestreet. Let’sgoandhelphim.3.Iusedtobeafraidofstayingina...