Choose the correct modal :
choose from: Can, Could, Should , must, to be able to & have to
1. .... I drink some water in the classroom?2. My leg is broken, I ... play football.
3. You ... read this book. It is very exciting!
4. ... you open the window, please ?
5. I ... study for this test. I don't want to fail it.
6. We ... be on time for school.