some Engilsh qusetions about名词性从句

some Engilsh qusetions about名词性从句
What surprises us is that she dosen't even know ____the difference between the two opinions lies.这里为什么不能填what,而要填how呢?
Work on Rome's Palatine Hill has turned up a serise of discoveries,including____might be the underground cave.这里为什么不能填the one,而要填what?
_____has recently been done to provide more buses for the people,a shortage of public yrhicles remines a serious problem.
A.What B.Though what C.in spite of what D.However what
这里怎么选啊,一点思路也没有
____has finished the work ahead of time will be reward.为什么不能填those who ,anyone,no matter who,而只能填whoever?
Dose it make any difference____he refuses or accepts the invitation?这为什么不能填which?which不是也能引导名词性从句吗?
which和whom都能引导名词性从句,但which一般如何使用呢?它与what的用法有什么区别?请举几个使用which的名词性从句的例子,而如何判断它引导的是定语从句还是名词性从句呢?
who 和whom用法有什么区别呢?请举例说明.
which和whom都能引导名词性从句，但which一般如何使用呢？它与what的用法有什么区别？请举几个使用which的名词性从句的例子，而如何判断它引导的是定语从句还是名词性从句呢？
who 和whom用法有什么区别呢？请举例说明。