Fill in: must (2), may, have to, mustn't, can, had to, should, ought to, can't could
1. They ... go now or they'll miss the flight.
2. Baby ... walk, but he... crawl.
3.1 ... sweep the floor.
4. ... I use your laptop?
5. He... run faster when he was young.
6. Sam ... go home. It's late.
7. My father ... stay at work till midnight yesterday.
8. Do you think I ... apply for the job?
9. People... litter in the city.
10. You ... wash your hands before eating​