Choose the correct words. 1 Michael looked unhappy when he saw his test results. He can't / must have got a good mark.
2 'Why are they late?' 'I don't know. They might / can't have missed the bus.'
3 She's really good at playing the piano now. She must I might have practised a lot
4 I don't know who phoned. Maybe it can't I could have been that boy we met yesterday.
5 Your eyes were open. You might / can't have been asleep!