1. Students _mustn’t__ leave
the classroom before the ring bells. 2. You _should__ brush your teeth in the
morning. 3. _can__ you pass my pencil to me? 4. You've been driving all
day. You _must__ be exhausted! 5. You __shouldn’t__ smoke so much. It's bad
for your health! 6. I know he speaks five languages, but __can__ he
speak Arabic? 7. I'm on my way. I __may__ be there in about 10 minutes.
8. I _can’t_ afford that. 9. This _can__ be dangerous if you don't
have the right equipment. 10. You __shouldn’t__ yell at your parents. It's
not nice.