我对地理很感兴趣，尤其是学习不同国家的文化。

I'm really interested in ___geo, especially learning about cultures of different countries.

这栋建筑采用地源热泵系统来调节室内温度。

The building uses a ___geothermal system to regulate indoor temperature.

我们下载了一个应用来玩地理藏宝游戏。

We downloaded an app to try ___geocaching with friends.