Here are the best options for each blank based on the context of the text about Ethan's family:

21. **B. includes** - "The family includes his grandfather, his parents, and two sisters."
22. **A. listening** - "Ethan's grandfather enjoys listening to the radio and playing chess."
23. **D. riding** - "His grandfather rode a horse."
24. **C. ride** - "He wishes he could ride a horse to school one day."
25. **B. social media** - "They have accounts on social media."

So the final answers are:
- 21: B
- 22: A
- 23: D
- 24: C
- 25: B