1) Maybe Mike is at school. He...be at school a) Must b) Could 2) I'm sure he didn't tell you the truth. He...have told you the truth a) Can't b) May not 3) It's obvious that something went wrong. Something....have gone wrong a) Can't b) Must 4) Perhaps this hotel is not very expensive. This hotel...not be very expensive a) May b) Must 5) It's possible that he works for the government. He...work for the government a) Can't b) Might 6) Jim is asleep at his desk. He...be tired a) Can't b) Must

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