Modals for permission, ability and obligation

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You _______ smoke in the school premises.

MUSTN'T / CAN'T

He ______ go into the restaurant because he was wearing swimming trunks and flip-flops

WASN'T ALLOWED TO / COULDN'T

I'm sorry but I ______ do my homework because I was sick.

COULDN'T / WASN'T ABLE TO

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