must mustn't and needn't

I _____________________ take my medicine three times a day. (must / mustn't / needn't)

The doctor said I _____________________ smoke so much. (mustn't / needn't / have to)

Students ---- wear uniform to school. (mustn't / needn't / have to)

You _____________________ shout in a library. (must / mustn't / needn't)

You ---- hand in your assignment before the deadline. (must / mustn't / needn't / don't have to)

She has enough food in the fridge, so she _____________________ go shopping every day. (must / mustn't / needn't / doesn't have to)

Those who finish their exam ---- start making noise. (must / mustn't / needn't / don't have to)

You _____________________ help me. I can prepare the meal on my own. (must / mustn't / needn't / don't have to)

You-----wear a helmet when driving a motorbike. (must / have to / needn't)

Students ---- come to class late. (must / mustn't / needn't / don't have to)

Students ---- stay at school during lunch break, they can go out. (must / mustn't / needn't / don't have to)

You ---- bring your tennis rackets for your PE classes. (must / mustn't / needn't / don't have to)

The book I gave you is very valuable. You _____________________ be careful and take good care of it. (must / mustn't / needn't / don't have to)