Ответ:
1. What did you buy yesterday? 2. When did he catch the ball? 3. Where did they see this book? 4. Who dreamed of a new game? 5. When did you play football? 6. Where did they ski? 7. Where did you practice karate? 8. Who painted this picture? 9. Where did you put my ball? 10. When did he lose his keys? 11. Where have you been? 12. Who built this building? 13. Who swam in the pool yesterday? 14. Where did you break your arm? 15. Why did they forget about homework? 16. Who drank my juice? 17. Where did you keep the notebooks? 18. What did you see in Kaliningrad?