问题描述：
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
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
问题解答：
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