关于定语从句的几个问题.1.I'll never forget the day ____ we meet each ot

关于定语从句的几个问题.
1.I'll never forget the day ____ we meet each other last week.
2.I'll never forget the days ____ I spend with your family.
填关系代词或关系副词,（顺便问一下什么叫关系代词和关系副词）,一个是day一个是days,填when还是that,为什么?
3.This is the school ___used to study.请问school算地点吗,填where还是that呢?
4.My son goes to No.1 Middle School _______ I used to study in,我知道这句话可以填in which或where,但是填什么study in 的in要省略呢?
5.我有的时候看先行词是place的时候引导词是where,有的时候是which,请举几个例子帮我辨别一下.
以上几个问题在线等,希望不要复制一大堆,仅仅用自己语言回答,感激不尽,好的再加分.另外确定的再来,没有把握就请不要误人子弟了谢谢
Do you stil remember the place___we visited last week
Do you still remember the place____we visited the painting exhibition
这两个怎么填，为什么
最后一个：1.Have you ever been to Hangzhou, ____ is famous for the West Lake.
2.Tom will go to Shanghai ,____ live his two brothers 填关系代词或副词。是不是只要看到逗号都是非限制性定语从句都填that,