Students _____ submit their final research paper before the deadline next Friday., should, must, You ____ enter the restricted laboratory are without proper safety gear., cannot, can, Since the traffic light is red, all vehicles ______ stop completely before the line., should, must, Visitors _____ take flash photography inside the museum, as it damages the artifacts., mustn't, should, _____ I borrow your dictionary for a moment, Professor?, may, have to, Because he is still a minor, he ______ obtain his parents' consent to travel abroad., must, need, If you finish all your work early, you ______ leave the office thirty minutes early today., should, may, I _________ pay my electricity bill immediately, or the power will be cut off tomorrow, have to, should, She ________ make international calls on the company phone for personal reasons., cannot, must not, The security guard told me I ______ bring my backpack inside the mall, so I used the locker., Must not, should not.

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