You ....................... raise hand to speak in the class. (must/ mustn't)
must
You ................... wash your hands regularly. (must / mustn't)
must
You .................... sing and dance in the library. (must / mustn't)
mustn't
You ...................... late for school. (must / mustn't)
mustn't
You .................... keep off the grass.
must
You ....................... brush your teeth twice a day. (must / mustn't)
must
