猎人在森林里发现了一个熊的洞穴。

The hunter found a bear's ___den in the forest.

她在阁楼上布置了一个温馨的小角落作为书房。

She set up a cozy ___den in the attic for her study.

那个废弃的仓库是赌徒们的聚集地。

The abandoned warehouse was a ___den for gamblers.