Ответ:

1. are playing, have been playing

2. entered, were playing

3. has been working

4. have been working

5. will go, второй пропуск не знаю

6. was, have visited

7. are waiting, have been waiting

8. have (never) been

9. fell

10. was watching, switched

11. tried

12. entered, were sitting, was looking, didn't see (наверное), turned

13. does (revenue) mean

14. passed

15. doesn't go