Modal verbs for obligation and permission - Focus 2 - 6.5

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You ______________ be physically fit to be a fire-fighter. a can b have to c need

have to

A doctor _____________________________ often work long hours and night shifts. a must b needn't c can’t

must

A teacher ____________________look smart or wear a suit to work. a mustn’t b doesn’t need to c can’t

doesn't have to

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