1.-----it is swimming in the river!

1._____it is swimming in the river!
A.What a fun B.What fun C.How fun D.How a fun
我选的是C.
可是What 开头的感叹句不是要有名词吗?
2.He often tells lies.We shouldn't believe him _____.
A.no longer B.any longer C.any more D.more
想问一下no longer\ not any longer 和no more\not any more 有什么区别.
好像no longer 是表示过去某一状态不再延续.no more 是表示动作不在发生.
可是如果是这样的话,不是应该选B吗?
另外,believe 是延续性动词还是瞬间动词?