Complete the sentences with a suitable modal verb. Use must, don't have to, might, should, must have, mustn't, can't have and shouldn't.
1. You _______ drive on the pavement. It's illegal.
2. You _______ say that. It's not nice.
3. I _______ go to work tomorrow because it's a public holiday.
4. I _______ buy this CD, but I'm not sure.
5. He's not here. He _______ gone out.
6. She didn't study enough. She _______ passed her exam.
7. You _______ eat more vegetables. They're good for you.
8. You _______ be 18 before you can buy alcohol.