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must

have to

I _________ submit my homework before 12 o'clock because the deadline is 12 o'clock.

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You ______ stare at the computer screen for too long. It is really bad for your eyesight.

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You _____ become more responsible by sharing the housework with other people in our family.

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She_____ stay at home to look after her children because there is no one to help her.

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My grandparents live in the suburbs, so whenever we visit them, we ______ take a bus.

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We _____ buy souvenirs for Sally. She doesn't like them.

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You _____ stay up at night, which is not good for your health.

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Your grandparents live far from you, so you  _______ talk to them on the phone regularly.