我们在森林里发现了一个熊的洞穴。

We found a bear's ___den in the forest.

她喜欢在书房里读书，那里是她的小天地。

She loves reading in her cozy ___den, which is her little sanctuary.

警方突袭了那个毒品窝点。

The police busted the drug ___den last night.