下列句子中的“之”字的用法和解释归类正确的一项是①胡为乎惶惶欲何之 ②水之积也不厚 ③覆杯水于坳堂之上 ④响穷彭蠡之滨⑤鹏之徙于南冥 ⑥楚之南有冥灵者 ⑦众人匹之 ⑧之二虫又何知⑨知来者之可追 ⑩报养刘之日短也 ⑾句读之不知 ⑿蚓无爪牙之利，筋骨之强

contrary, I think it is Truman, ___you, ___ toblame.

How did you make him_____the housework _____ you

iversity is saving $ 300,000 per year by its energy ______ efforts.

(2013·长沙高考模拟)I ________ him in time, otherwise he would have fallen off the bike