11. Joe is keen on sport, ? 12. Maria hasn’t forgotten about the meeting, ? 13. We shouldn’t enter this room, ? 14. There weren’t having any problems, ? 15. I lost my key, ? 16. You didn’t apologise to Frank, ? 17. I had remembered to book the tickets, I? 18. He wasn't in my room, ? 19. She will come at 6, ? 20. He had to do his exercise, ?