Obligation and Necessity

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At our school we __________ wear a uniform. (Should, shouldn't, have to, don't have to, must, mustn't)

have to

.- You __________ cross the roads without looking. It’s dangerous. (Should, shouldn't, have to, don't have to, must, mustn't)

mustn’t

You _______ turn on the central heating. It’s automatic. (Should, shouldn't, have to, don't have to, must, mustn't)

don’t have

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