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