must, You __________ wear a helmet when you ride a bike., have to, I __________ wake up early tomorrow for work., can, She _________ play the piano very well., could, When I was a child, I __________ swim very fast., ought to, You __________ apologize to her., to be able to, She __________ speak three languages fluently., May, __________ I open the window?, should, You __________ drink more water every day., might, It _________ rain later, so take an umbrella..

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