Must mustn't need have to

I have got a lot of homework to do. So, I can't go out, I _____ stay at home today.

If you are under 13 you _____ get your parents' permission.

You really see that new documentary. It’s fantastic.

You........to go now. The train leaves in an hour, so you’ve still got some time left. 

You ........... speak with a full mouth. that’s very impolite.

You .............. put salt in her food; the doctor said she can't eat salt.