Here are the best answers for each blank based on the context:

1. A. reject
2. B. examining
3. C. values
4. A. exchange
5. C. contribution
6. B. effort
7. A. analytical
8. D. issue
9. B. contribution
10. C. knowledge
11. D. everyday
12. B. propose
13. D. live-streamed
14. A. social
15. B. capable
16. C. charge
17. B. keep
18. A. by
19. C. includes
20. D. confidence

21. A. solution

Feel free to ask if you need further clarifications!