You shouldn't really leave before five, but there's nothing to do now. (to be not supposed to), We're not allowed to give out personal details of clients. (can't/musn't), You absolutely mustn't make any noise while the exam is taking place. (to be allowed to), There's a room at the back of the building where you can smoke. (can't/to be allowed to), It's against company rules to leave your computer on overnight. (to be not allowed to).

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