For the safety, everyone _________ obey the traffic rules when he is driving or walking.A．needB．must

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• —_____I bring my ID card with me next time?—No, you needn’t. I have copied and stored it in my compu
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• Mike, please be quiet, or the other students hear me clearly.A．mustn’tB．shouldn’tC．needn’tD．can’t-七
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