If you have a persistent cough, you ____ see a doctor. You look tired and pale. You ____ go to school today; you should rest. To avoid getting the flu, people ____ wash their hands frequently. The sign in the hospital says: "Visitors ____ wear a mask." When you are sick with a contagious virus, you ____ share your food or drinks with others. To stop the infection, the patient ____ take the complete antibiotic treatment. My brother broke his leg, so now he ____ use crutches to walk. It's just a simple cold. You ____ go to the hospital. She is allergic to penicillin, so she ____ tell the doctor before any treatment.

Modal verbs: should, must, have to [practice]

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