一个神秘的陌生人出现在村子边缘，引起了居民们的好奇。

A ___mysterious stranger appeared at the edge of the village, sparking curiosity among the residents.

这件古代文物的神秘失踪仍然是最大的悬案之一。

The ___mysterious disappearance of the ancient artifact remains one of the greatest unsolved cases.

她收到了一个没有寄件人姓名的神秘包裹，这让她既兴奋又不安。

She received a ___mysterious package with no sender's name, which made her both excited and anxious.