It seems that you are requesting to identify the pronunciation of the past tense "-ed" ending for each set of words listed by their individual pronunciations. The pronunciation of "-ed" endings in English can be categorized into three different sounds: /t/, /d/, and /ɪd/. Here's how they apply to your list:

21. A. killed /d/
     B. cured /d/
     C. crashed /t/
     D. waived /d/

22. A. imagined /d/
     B. released /t/
     C. rained /d/
     D. followed /d/

23. A. called /d/
     B. passed /t/
     C. talked /t/
     D. washed /t/

24. A. landed /ɪd/
     B. needed /ɪd/
     C. opened /d/
     D. wanted /ɪd/

25. A. cleaned /d/
     B. attended /ɪd/
     C. visited /ɪd/
     D. started /ɪd/

26. A. talked /t/
     B. fished /t/
     C. arrived /d/
     D. stepped /t/

27. A. wished /t/
     B. wrapped /t/
     C. laughed /t/
     D. turned /d/

28. A. considered /d/
     B. rescued /d/
     C. pulled /d/
     D. roughed /t/

29. A. produced /t/
     B. arranged /d/
     C. checked /t/
     D. fixed /t/

30. A. caused /d/
     B. examined /d/
     C. operated /ɪd/
     D. advised /d/

31. A. discovered /d/
     B. destroyed /d/
     C. developed /t/
     D. opened /d/

32. A. repaired /d/
     B. invented /ɪd/
     C. wounded /ɪd/
     D. succeeded /ɪd/

33. A. improved /d/
     B. parked /t/
     C. broadened /d/
     D. encouraged /d/

34. A. delivered /d/
     B. organized /d/
     C. replaced /t/
     D. obeyed /d/

35. A. painted /ɪd/
     B. provided /ɪd/
     C. protected /ɪd/
     D. equipped /t/

36. A. tested /ɪd/
     B. marked /t/
     C. presented /ɪd/
     D. founded /ɪd/

37. A. used /d/
     B. finished /t/
     C. married /d/
     D. rained /d/

38. A. allowed /d/
     B. dressed /t/
     C. flashed /t/
     D. mixed /t/

39. A. switched /t/
     B. stayed /d/
     C. believed /d/
     D. cleared /d/

40. A. recommended /ɪd/
     B. waited /ɪd/
     C. handed /ɪd/
     D. designed /d/

41. A. annoyed /d/
     B. phoned /d/
     C. watched /t/
     D. remembered /d/

42. A. hurried /d/
     B. decided /ɪd/
     C. planned /d/
     D. wondered /d/

43. A. posted /ɪd/
     B. added /ɪd/
     C. managed /d/
     D. arrested /ɪd/

44. A. dreamed /d/
     B. neglected /ɪd/
     C. denied /d/
     D. admired /d/

45. A. admitted /ɪd/
     B. advanced /t/
     C. appointed /ɪd/
     D. competed /ɪd/

46. A. announced /t/
     B. apologized /d/
     C. answered /d/
     D. argued /d/

47. A. complained /d/
     B. applied /d/
     C. compared /d/
     D. polished /t/

48. A. booked /t/
     B. watched /t/
     C. jogged /d/
     D. developed /t/

49. A. contributed /ɪd/
     B. jumped /t/
     C. introduced /t/
     D. vanished /t/

50. A. whispered /d/
     B. wandered /d/
     C. sympathized /d/
     D. sentenced /t/

These pronunciations are based on standard rules and may vary slightly with different accents or dialects.