At the end of the exam you __________ stop writing when I say so.
must
Oh snap! I forgot that we ________ to study for the test tomorrow!
have
Do you ________ to wear a tie at work?
have
I'll tell you a secret, but you __________ tell anyone! (negative)
must not / mustn't
At my school, you ______________ to wear a uniform. We can wearn anything we like. (negative)
don't have
I'm sorry, but you _________ wear a helmet in here. (negative)
must not / mustn't
People _________ smoke in public places in my country. (negative)
must not / mustn't
In Brazil, you ______ cross the road at the pedestrian crossing.
must
You _________ to have a passport to travel to most other countries.
have