She is shaking and looks very scared. She ______ be nervous., Must, Might, Could, Can, He is standing outside the school. He ______ be at home., Must, Can't, Might, May, They are carrying umbrellas. It ______ be raining outside., Can't, Might, Mustn't, Can't be, The lights are off and nobody is answering the door. They ______ be at home., Must, Might, Can't, May, Which modal expresses high certainty?, Might, Could, Must, May, Which modals express possibility?, Must and can't, Might, may and could, Must and might, Can't and must

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