All the beepers and mobile phones must___ in class.

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• As it is known to all,owning mobile phones has become a new necessity for common students.
• all beepers and moble phones should be kept off during the meeting.keep
• All the beepers and mobile phones must___ in class.
• All the beepers and mobile phones must ___ in class
• All the mobile phones must be__off before the meeting __
• I was glad to be like my friends which all had mobile phones.
• Attention,please!All mobile phones must __ during the meeting.选项A turn B be turned off C are turn
• --what else aren't allowed to do during the meating?--oh,all the mobile phones must( )
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