May we leave the classroom now? No, you _____. You_____ to leave until the bell rings.
A：mustn't, are allowed
B：don't have to , are supposed
C：needn't , aren't allowed
D：can't , aren't supposed
→We must have a ____ ____ to keep healthy.
美国航空航天局宣布，2012年12月31日，他们用空间观测器记录下了在太阳表面发生的一次大规模耀斑爆发．这表明新一轮太阳活动周期开启．据此回答下题．
—Yes, the little boy has a ____ for drawing. He will be a painter_____.
学生小丽理发后，店主以只能用会员卡结账为由，强迫小丽办了一张100元会员卡。作为一名消费者，小丽可以采取的正确维权方式是
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