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在下面定语从句中，用适当的介词填空。
He bought a book yesterday, the author ________ which is a teacher．
The desk ________ which Jack is leaning is John’s．
My glasses, ________ which I was like a blind man, fell to the ground and broke．
Ours is a beautiful school, ________ which we are proud．
His bike ________ which he went to work was stolen last night．