下列句子中加点字的用法，归类正确的一项是（ ）①吾得兄事之 ②单于壮其节 ③宁许以负秦曲 ④假舟楫者，非能水也⑤顺流而东也 ⑥群贤毕至 ⑦携幼入室 ⑧德合一君⑨侣鱼虾而友麋鹿 ⑩追亡逐北 而相如廷叱之 大将军邓骘奇其才

Who is theboy over there?—It’s ______brother.

Convenient ___private cars are for us, they may also cause traffic accidents and pollution

The computer system _____ suddenly while he wassearching for information on the Internet.

Where do you swim —At the __________.