must, You ______ wear a seatbelt when driving., can, I ______ speak three languages., mustn't, You ______ use your phone during the exam., may, They ___ be at the mall., don't have to, You ______ bring snacks. We already have some., can't, He ___ be at home. I saw him outside., should, You ______ see a doctor if you feel sick., have to, Students ______ wear uniforms in this school..

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