题目内容：

14.____B___ at his paper over the weekend,Neil didn't finish it.
A.As he worked hard B.Hard as he worked
C.How he worked hard D.How hard he worked
16.That was ____D___ matter that I had no choice but to talk it over with my parents.
A.a such serious B.a so serious C.such serious a D.so serious a
第一题怎么区分as还是how,顺序又怎么区分呢?
第二题怎么区分such还是so,a的位置该在哪?