Should ali must?

Vprašanje 1
Complete the sentences with the correct modal verb:
should / shouldn't / must / mustn't
I think you exercise more.
You park here. Look at the sign!
He is very friendly; you call him more often.
I pass this exam!
We obey the rules.
She put too much sugar in her coffee.
He brush your teeth after each meal.
Children eat chewing gums.