说到如何管教我的儿子，我想我最清楚该怎么做。

When it comes to dealing with my own son, I think I ___know ___best.

在许多传统家庭中，人们相信父亲总是最有智慧的。

In many traditional families, there was a belief that the father always ___knew ___best.

在这件事上你应该相信你的医生；毕竟，她最了解你的病史。

You should trust your doctor on this matter; after all, she ___knows ___best about your medical history.