Use of English. Rules and Permissions Choose the correct option for each gap.

1. Can you speak slower? I don't understand you.
2. We must be quiet in the library. It is a rule.
3. You can't use my laptop right now, I'm using it.
4. I can fry eggs for you if you are hungry.
5. You mustn't use your cell phone during the test. It's cheating.
6. Your bruise doesn't look good, you must visit a doctor.