他不知道警察在监视他。

He was ___unaware that the police were watching him.

我完全不知道这个问题。

I was completely ___unaware of the problem.

尽管你可能是一个科目的专家，但你可能会不知道其他科目的一些基础知识。

Although you may be an expert in one subject, you can be ___unaware of some basics in others.