Question

1.He has lost the key to the box in which the paper are kept

2.My glasses,without which I was like a blind man,fell to the ground and broke
3.the age at which children can go to school is seven
4.this is the room which his father lives in
5.this is the room wherehis father lives
6.this is the room in which his father lives
以上定语从句改为两个句子

Answer 1

He has lost the key to the box. The papers are kept in the box.
My glasses fell to the ground and broke. I was like a blind man without my glasses.
The age for school is seven. the children can go to school at seven.
This is a room. His father lives in the room.
This is a room. His father lives in the room.