Ngữ pháp: Động từ khuyết thiếu "Must"

Choose the best answer to complete the sentence.

Travelling on mountains is really dangerous, so you _____ go alone.

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We _______ eat sweets in the classrooms.

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I ______ watch TV late at night. My parents say I must go to bed early.

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You____ put the rubbish into the bin.

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You ______ take photos in this museum. It's against the rule.

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You ________ speak on the mobile phone on an aeroplane.

Choose the best answer to complete the sentence. I _______ do my homework. My teacher said so.

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This is the smoking room at this airport . You ______ smoke in this room.

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You _______ across the road without looking around.