Possibility and Certainty

Help

She looks sad and she's crying, so she _____ be happy. a) must b) couldn't c) can't d) might

c) can't

I'm not sure but she _____ live in that building. a) can't b) must c) might

c) might

The treatment _____ be good. All the patients are better. a) must b) can't c) might not

a) must

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