He got 100% on the test. He ___ have studied very hard., must, might, They aren’t at home. They ___ be at work, but I am not sure, might, must, That ___ be John — he’s on holiday in Spain., can't, mustn't, She looks very tired. She ___ have slept well last night., can't, couldn't, The lights are on. Someone ___ be inside., must, can, He hasn’t eaten all day. He ___ be hungry., might, must, They’re not answering messages. They ___ be busy., might, can't, This ___ be the right answer — it doesn’t make sense., might, can't.

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