我的好奇心占了上风，我打开了信封。

My ___curiosity got the better of me and I opened the envelope.

只是出于好奇，你是怎么得到我的地址的？

Just out of ___curiosity, how did you get my address?

当战士离开后，[他]出于好奇心探索了洞穴，[令他]大为惊讶的是，[他]找到了宝藏。

When the warrior had left, [he] explored the cave out of ___curiosity and [to] his big surprise [he] found the treasure.