我想她怀疑我有所隐瞒。

I think she suspected I was ___holding something ___back.

说实话，关于这个情况，我还隐瞒了很多细节。

To be honest, I am ___holding ___back a lot more details about the situation.

他选择隐瞒关键信息以避免引起恐慌。

He chose to ___hold crucial information ___back to avoid causing panic.