Fill the gaps with the correct modal verb

Gap-fill exercise
By Juan Ignacio Montorio

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

1. You smoke in here. It's prohibited.
2. John speak English last year, but he can now.
3. Do we switch off our mobiles in class?
4. It'll be OK. You worry.
5. My friend wear a uniform at school.