must, might, may, could, can't
to complete the sentences:
1. Where is David? He _________ (be) at school. It's 10 o'clock now and classes begin at 8
2. She ______(think) that it is a good idea. It's crazy!
3. I'm absolutely sure! They _________(arrive) tomorrow, because I got a telegram.
4. Are you joking! David _________(go) to Paris next week. He doesn't have enough money.
5. They _______(live) in New York, but I'm not sure.
6. The concert _____________(be) wonderful tonight. Gergiev is a great conductor.