Here are the correct options for questions 21 to 37 based on the context provided:

21. **B. collecting coins**
22. **C. horse riding**
23. **A. collecting**
24. **A. playing**
25. **B. painting**
26. **B. making**
27. **A. gardening**
28. **C. playing**
29. **A. going**
30. **C. playing**
31. **B. reading**
32. **A. playing**
33. **B. collecting**
34. **A. going**
35. **A. making**
36. **B. collecting**
37. **D. buying**

Feel free to ask if you have more questions!