Modals of necessity

At the airport, you _____ show your passport.

You ____ to wear a uniform at ICPNA.

• must

• should

• don't have

• had better to

I _____ save some money for the future.

• have to

• have got to

• must

• didn't have

Last year, students _____ to take a final exam.

I ______ pay the bills.

• have to

• have

• must

• didn't