Students ______ wear the correct school uniform today., must, had to, will have to, In the exam, students ______ use a black pen last year., can't, must, couldn't, Last semester, students ______ pay for school books. It was free., didn't have to, won't have to, don't have to, Next year, students ______ bring their own lunch to school., had to, will have to, have to, At school now, students ______ run inside the school buildings., can't, couldn't, won't be able to.

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