I__________it\'s important to sleep eight hours a night怎么填

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$I__________it\'s important to sleep eight hours a night怎么填$

I__________it\'s important to sleep eight hours a night怎么填
I__________it\'s important to sleep eight hours a night怎么填

I__________it\'s important to sleep eight hours a night怎么填
可填think、know、.要看上文