下列各句中，划线字用法分类正确的一项是 （ ）①刑于寡妻，至于兄弟 ②不过数仞而下 ③高余冠之岌岌兮 ④肥甘不足于口，轻暖不足于体 ⑤抑王兴甲兵，危士臣 ⑥老吾老，以及人之老

n as I got to the airport, I realized I ________ my ID card at home.

is attention _____ on his book, he didn’tnotice me enter his study.

You should be more confident in______ situation is challenging you.

g took steps to limit the kinds of high-risk ofborrowing money from the banks that can create the high price of housing,______ happened in the United States．