请教大家几个英语问题~~~

All the furniture has arrived undamaged.这里的undamaged是形容词，放在arrived后面是不是应该这样理解？：All the furniture has arrived, undamaged.
No one except his supporters agree with him.这句话是正确的吗？因为我在看专四语法书，所以之前看到一句No one except my parents knows anything about it.这两句话结构是完全一样的啊，但是书上说前者是才用就近原则,supporters所以用agree。而后者又说是带有no构成的复合代词做主语时谓语用单数。。完全不明白。。
Western Nebraska generally receives less snow than does Eastern Nebraska.这里的does用法是什么？请详细说一下~~
问题好多~辛苦高手解答一下~~感激不尽啦啦啦~~^^