You ________- use your phone while you are driving. It's the law., mustn't, don't have to, You ______ clean your phone regularly. It's a good idea, but not a rule., should, have to, To prevent eye strain, you_____________ stare at a screen for too long. It's very important!, mustn't, don't have to, You ________ turn off your computer if you are just taking a short break., don't have to, mustn't, If you want to be a doctor, you ____________ study for many years., should, have to

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