A. WORKED B. WORK C. TO WORK D. WORKING___________THE END_________...

50. A. worked B. work C. to work D. working___________THE END____________KEYSI- 1. C 2. D 3. B 4. A 5. B 6. D 7. B 8. C 9. D 10. B 11. C 12. D 13. B 14. C 15. B 16. C 17. B 18.B 19. B 20. D 21. C 22. B 23. C 24. B 25. C 26. B 27. D 28. A 29. D 30. A 31. A 32. D 33. D 34.D 35. B 36. C 37. A 38. D 39. C