Complete the sentences with must or mustn't
1you..........................help your mother with the heavy box
2It's very cold .you .....................go out
3you...............................look after the house when your parents are awaff
4You..................................wash  your face in the morning
5you..............................take your umbrella because it's raining
6you................................drink that milk , it's very hot
7You........make noisy in the class
8It's dangerous,you....................................touch that wire
9 you................................be rude to your teacher
10 in the class,you..................study hard