我在市中心的图书馆里找到了那本稀有书籍。

I ___got ___hold ___of a copy of that rare book at the library downtown.

我给他打了一上午电话，但一直联系不上他。

I tried calling him all morning, but I couldn't ___get ___hold ___of him.

我们需要先拿到钥匙才能进入这栋楼。

We need to ___get ___hold ___of a key before we can enter the building.