1. He had to leave early because he was afraid to miss
the train. 2. I think you should/must apologize. It is your mistake. 3. Don’t
worry. You can/may use my phone to call them. 4. I must go and see them today. It
is very important. 5. As soon as I opened the door, I could smell gas. 6.
She can easily translate the text because she knows English well. 7. The
manager says that we have to/must complete the project by Monday. 8. You can park in
front of my house. 9. I wonder where Kate is. She must/should be here by now. 10
You must/should listen to your teachers to make progress. 11. The pool was closed,
so we could not swim. 12. Can/may I see the manager, please? – Certainly.