1) you go home.it's getting late. a)should b)can c)mustn't 2)help him! he swim! a)shouldn't b)can't c)don't have to 3)you stay on the main path,but it's a good idea. a)shoudn't b)mustn't c)don't have to 4)you go out without your mobile.what if you get lost? a)don't have to b)can't c)shouldn't 5)we leave immediately.the tsunami is coming. a)mustn't b)have to c)can 6)i've broken my leg.you leave me here on the mountain. a)mustn't b)can c)don't have to