Fill in the necessary modal verbs. 1) Freddy ... stay in bed last week, because he was I'll. 2) ... she swim well? — Oh, no. She ... swim very well. 3) Jack, you ... be polite with your teachers! 4) ... I close the door? — No, you ... . It's too hot here. 5) Children, you ... be late for lunch.
1) had to
2) Can, can't
3) must
4) Must, mustn't
5) mustn't