Have to, Must, Should Usage — Exercise 3
Fill in the blanks with the best modal verb from the list below. Keep in mind that "ought to" is more formal than "should." In more formal sentences, use "ought to" instead of "should."
could – must – mustn’t – should – shouldn’t – have to – don’t have to – ought to – ought not to – were able to
1You show your ID before entering the building.
2You talk during the exam.
3You look sick. You stay at home today.
4Visitors keep their phones silent in the museum.
5You bring food because everything is prepared.
6Students submit their assignments on time.
7You drive so fast in the city.
8Employees share confidential information.
9I swim when I was five years old.
10We finish the project before the deadline.