Why were there no buses yesterday? Maybe it was the snow or they _____ been on strike., might have , must have , You _____ seen her, surely! She was standing right in front of you., must have , could have , Let's ask at reception to see if they have your keys. Someone _____ found them., might have , could have , He _____ gone to Russia. He didn't have a passport., might have , couldn't have , It is still a mystery how the robber gained access to the bank. Police are investigating whether the suspect _____ known one of the employees., may have , couldn't have .

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