Кто знает? помогите пожалуйста. 52 упражнение

1. Came, was having 2. Returned, was listening 3. Entered, was drawing 4. Came, was doing 5. Was airing, caught 6. Rang, was leaving 7. Met, was going 8. Was washing, knocked 9. Were dancing, came 10. Was washing, broke 11. Rang, was learning 12. Was playing, saw 13. Fell, was climbing 14. Saw, were playing 15. Entered, saw, were drinking 16. Was doing, made 17. Came, were sitting 18. Was watching 19. Was driving, felt 20. Were making, opened