在下面定语从句中，用适当的介词填空。

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

在下面定语从句中，用适当的介词填空。

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

在下面定语从句中，用适当的介词填空。

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

在下面定语从句中，用适当的介词填空。

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

在下面定语从句中，用适当的介词填空。

The wolf ________ which the sheep was killed was shot．

在下面定语从句中，用适当的介词填空。

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

在下面定语从句中，用适当的介词填空。

He built a telescope ________ which he could study the skies．

把下面句子合并成一句。

I always remember the days．We spent them together．

把下面句子合并成一句。

The house is our library．Its door is painted red．

把下面句子合并成一句。

The student is in the room．His name is Tom．