在定语从句中关系代词that,who,which,whose,whom,的区别

在定语从句中关系代词that,who,which,whose,whom,的区别
关键是who,whom,whose的区别。
我知道whom（指人，用作宾语表语）whose（指人，作定语）who（指人）
这是老师讲的，但我不太理解，能举some examples吗？
比如说下面这道题：
（1）—Who is your favorite singer，Julia？
—Well，it's hard to say。I like singers_________write their own lyrics。
A，who B，whose C，which D，what
(2)He wasn't the only one of the students _________ the TOEFL.
A who had passed B who have passed
C who has passed D whom passed
希望哪位大虾能帮我指点迷津，最好再举一些例句，本人将感激不尽，可能会再追加悬赏。