Choose the correct words. 1 James couldn't finish the long-distance race. He might / can't have had an injury. 2 My grandma played tennis until she was 80 She can't / must have been very fit. 3 I'm not sure who phoned. I missed the call. I suppose it must could have been my sister 4 Sophia is early today. She must / can't have overslept 5 Jacob looks upset. He must/can't have done badly in the test. 6 Elena is away on holiday at the moment. You can't / could have seen her yesterday.