Fill in the gaps. Use must or have to in the positive of negative form. If you want to make progress, you _________ work

1. If you want to make progress, you must work regularly. 2. You mustn\'t open the window. It may fall. 3. I must eat more vegetables and fruit. They are good for me. 4. You don\'t have to pay for this book. It’s a present. 5. You mustn\'t interrupt your teacher. 6. My grandmother didn\'t have to work. Her husband had earned a lot of money.