Fill in the gaps. Use must  or have to in the positive of negative form.

If you want to make progress, you _________ work regularly.
You _______ open the window. It may fall.
I _________ eat more vegetables and fruit. They are good for me.
You _______ pay for this book. It’s a present.
You _______interrupt your teacher.
My grandmother ________ work. Her husband had earned a lot of money.