潜水员下潜到了湖的最深处。

The diver reached the ___deepest point of the lake.

她对失败有着最深的恐惧。

She has the ___deepest fear of failure.

我向他表达了我最深切的歉意。

I offered him my ___deepest apologies.

这本书探讨了人类意识最深奥的谜题。

This book tackles the ___deepest mysteries of human consciousness.