Jack came home so thin and weak that his children hardly ___ him.[ ]

An excellent teacher is believed to be one who cares about his students but asks for nothing __________.

Was it ______ he was playing volleyball on the playground_________ he got hurt?

对下列加点词的意义和用法的分析，正确的一项是(　　)①穷且益坚 ②若属皆且为所虏③宾主尽东南之美 ④臣之壮也，犹不如人

They have always treated us with open hands and we must be generous ________