Exercice sur les modaux en anglais

Complete the sentences by choosing the most appropriate modal verb among {must, mustn't, have to, don't have to, should, shouldn't, can, can't}. Explain the nuance of your choice based on the context.

1. You __________ submit your essay by $5:00$ PM; it is the absolute deadline set by the board.
2. We __________ bring our own equipment to the training session because the club provides everything for free.
3. You __________ touch the high-voltage wires; it is extremely dangerous and strictly forbidden.
4. You look very tired, you __________ get more sleep if you want to perform well in your exams.
5. It is only $8:00$ AM, so the school library __________ be open yet as the librarian arrives at $8:30$ AM.