Вставьте модальные глаголы can,may, или must 1) Students ... not be late for their...

Question

Вставьте модальные глаголы can,may, или must
1) Students ... not be late for their lessons.
2) ... I open the window?
3) ... I send this telegram today? - No, you needn't. You ... send it tomorrow.
4) ... you play football? - No, I ... not help you, I am very busy.

Answer 1

1) Students .must.. not be late for their lessons.
2) .May.. I open the window?
3) ..Must. I send this telegram today? - No, you needn't. You .can.. send it tomorrow.
4) ..Can. you play football? - No, I .can.. not help you, I am very busy.