在下面定语从句中填入适当的介词

Do you know the building ________ which is flying a red flag?

在下面定语从句中填入适当的介词

His bike ________ which he went to work was stolen last night．

在下面定语从句中填入适当的介词

The age ________ which children can go to school is seven．

在下面定语从句中填入适当的介词

I was surprised at the way ________ which he treated the old man．

在下面定语从句中填入适当的介词

In the dark street, there wasn’t a person ________ whom she could turn for help．

在下面定语从句中填入适当的介词

My glasses, ________ which I was like a blind man, fell to the ground and broke．

在下面定语从句中填入适当的介词

There is a tall tree outside, ________ which stands our teacher．

在下面定语从句中填入适当的介词

She has three children, all ________ whom are at school．

在下面定语从句中填入适当的介词

The wolf ________ which the sheep was killed was shot．

在下面定语从句中填入适当的介词

The woman, ________ whom I learned the news, is a nurse．