填入下面一段文字横线处的语句，最恰当的一句是（ ）有时候我在想，如果一个人能像骆驼一样坚忍不拔，不遗余力，奋力向前，那么你面前就不会有无法跨越的“死亡之海”。你可以蔑视面前的困难和不利的环境， ， ， ，但那沉甸甸的壮丽的旅程，足以使你感叹自己拥有着无悔的人生。

The mid-term exam is to be held ___ the end of this month

He had ever climbed this mountain several months before, but _____ he couldn’t find the way this time [ ]

mes the police a crime, but ________ him of having done it.

Offered the position of chairman, Smith _____, preferring to keep his current job. [ ]