Here are the correct answers for each numbered item:

12. **A. meaningful**
13. **B. saw - was waiting**
14. **C. was walking**
15. **B. checked**
16. **B. generous**
17. **A. waited**
18. **A. was walking**
19. **C. during**
20. **D. advantageous**
21. **B. donate**
22. **A. when**
23. **B. was happening - was sleeping**
24. **B. hopeful**
25. **C. volunteer**
26. **A. played - was**
27. **B. rang - was working**
28. **B. watched - was ringing**
29. **B. taught - repaired**
30. **A. when**
31. **C. during**
32. **D. waiting**

Let me know if you need any more help!