Choose the correct option to complete the sentences.

1. We mustn’t | don’t have to use our mobiles here. They are not allowed!
2. There’s a good train service to the city, so we mustn’t | don’t have to drive there.
5. You shouldn’t | oughtn’t pack many heavy things in your bag.
3. You ought | should to go to the doctor about your sore leg.
4. In England, drivers have to | should drive on the left.