Вставить must, mustn't, needn't, ought to. 1. Children ... touch switches. 2. You are much better and you ... stay in bed any longer. 3. You ... smoke if you want to be healthy. 4. You ... tidy your room every day. 5. She ... be more careful.
1)must
2)needn't
3)mustn't
4)must
5)mustn't