Question

这两道题怎么做为什么？

I know the reason ________ she studies so well .10. This is the room _________ he put up for the night.

Answer 1

这两句话都是定语从句。

1、I know the reason why she studies so well.

意思是：我知道她学习好的原因。这里的why相当于for which。

2、This is the room where he put up for the night. 

意思是：这就是他过夜的那个房间。根据意思用关系副词where，相当于in which。