3. Choose the right modal verb:
1.Drivers ... obey the speed limit
2. You .... Watch TV for so long.
3.The phone is ringing. It ... be Ann.
4. This is a lovely party, but it's getting late and we ..... go home.
5. You... see "Titanic"- it's a great film.
6.1 ...to water flowers. My brother always does them.
7. Sam... to decide for himself who his real friends are.
8. You ... walk to and from school instead of taking the bus if you want to get more exercise.
9. Your back hurts and the box is heavy. You ... carry it.
10.David! You ... play with sharp knives.
11. University students ... take exams twice during the year.
12. I think you ... lie down and take your temperature.​