Сomplete the sentences with must or mustn't. 1)You ____ do an allready test before you dye your hair. 2)You____stay in the sun for a long time.It's bad for your skin. 3)You____ride your skatebord without a helmet. 4)You____wear that skirt at school again. It's too short and it's too tight. 5)You____put on a coat.It's very cold outside.
1) must
2) mustn't
3) mustn't
4) mustn't
5) must