must和have to填空 Everyone__keep their dogs on a lead.You___buy tickets before you get on the bus

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must和have to填空 Everyone__keep their dogs on a lead.You___buy tickets before you get on the bus

Everyone (must) keep their dogs on a lead.
You (have to) buy tickets before you get on the bus.

must是强制性的,带有主观的要求; have to 是 不得不,是客观上的要求
第一句, 是强制的,订立的规则,所以填must
第二句,上车前买票是一般遵守的,所以填have to