说到管理这个项目，我相信团队领导最清楚。

When it comes to managing the project, I believe the team leader ___knows ___best.

那句老话“妈妈最清楚”在许多家庭中依然适用。

The old saying "Mother ___knows ___best" still holds true in many families.

在医疗问题上，我们应该相信医生最清楚。

In medical matters, we should trust that doctors ___know ___best.