在下高中生一枚，英语小白一个，希望高手能帮忙解答下！

1.That is her mother,_____works in taiyuan.
答案：who
问题：为什么不能用which
2.John invited about 40 people to his wedding,most of _____are family members.
A.them B.that C.which D.whom
答案：D
问题：为什么不能用which,which不是可以充当宾语吗？这句子的先行词是哪个？
3.The president of the World Bank says he has a passion for China,_____he remembers starting as early as his childhood.
A.where B.which C.what D.when
答案：B
问题：which在这里是指带前面那件事吗？那这句话理由先行词吗？定语从句里可以没有先行词吗？
4.The book tells stories of the earthquake through the eyes of those_____lives were affected.
A.whose B.that C.who D.which
答案：A
问题：这句话怎么翻译，为什么不能用who,能分析下句子成分吗？
5.That evening,_____I will tell you more about later,I ended up working very late.
A.that B.which C.what D.when
答案：B
问题：为什么不能用when ，which在这里做什么成分，指代什么？
6.After the flooding,people were suffering in that area,_____urgently needed clean water,medicine and shelter to survive.
A.which B.who C.where D.what
答案：B
问题：怎么翻译，为什么不能用where,people不是在前面组成个个句子了吗，who还来修饰它吗？
7.When deeply absorbed in work,_____he often was ,he would forget all about eating or sleeping.
A.that B.which C.where D.when
答案：B
问题：怎么翻译，能翻一下句子成分吗，为什么不能用when，which这里指代什么
8.She showed the visitors around the museum ,the construction______had taken more than three years.
A.for which B.with which C.of which D.to which
答案:C
问题：怎么翻译，把which还原到句子里怎么说？
9.The project is based on an agreement ,one of_____purposes is to ensure that the project can be accomplished before the deadline.
A.whose B.which C.its D.what
答案：A
问题：怎么翻译，为什么不能用which