今天看到形容词子句，写题目时有两题看不太懂。
1.Flying squirrels _________live in tropical rain forests
stay in the trees theire entire lives without ever touching
the groung. 这题解答答案给Whom 我想请教一下这题的翻译还有
为什么是用Whom，而不是用who
2.The person to ________ you should send your application
is the Director of Admissions.
这题答案是that/which 翻译怎么翻，还有为什么person后面有to
它替代的又是什么?