把下面的句子补充完整。   

(1)天行健，____                                  。    《周易》   

(2)路曼曼其修远兮，                                    。    《离骚》   

(3)____                       ，一片孤城万仞山。     

    羌笛何须怨杨柳，                              。——《出塞》   

(4)蒙汉情深何忍别，                             。