should; ought to

You should know what to read.

The sports world should, at this time, eliminate the collusion with criminal organizations.

If Tom doesn't do what he's supposed to do, please let me know.

He took it for granted that I knew the answer.

What began 21 months ago in the depths of winter cannot end on this autumn night. This victory alone is not the change we seek. It is only the chance for us to make that change. And that cannot happen if we go back to the way things were. It can't happen without you, without a new spirit of service, a new spirit of sacrifice. So let us summon a new spirit of patriotism, of responsibility, where each of us resolves to pitch in and work harder and look after not only ourselves but each other.