should, You __________ study more if you want better grades., have to, We __________ wear a uniform at school every day., need to, I __________ finish my homework before watching TV., used to, When I was younger, I __________ play outside every afternoon.  , may not, You __________ enter the lab without permission. , must no, Students __________ cheat on exams.  , should, He __________ drink more water because he is dehydrated.  , ought to, We __________ be respectful to our teachers..

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