Выпишите в следующих предложениях модальный глагол или его эквивалент:

1. Students may choose to major in a wide variety of subject areas.
2. Many of the customs can be traced back to early years of the University’s long history.
3. All applications for degree courses should be made through UCAS (Universities and Colleges Admissions Service).
4. You have to work hard if you want to achieve good results.
5. Written examinations are to take place in June.