Решить все.. нужно вставить a, an, some

3. some

4. a

5. some

6. some

7. an

8. a

9. some

10. an

11. a, some

12. some

13. some

14. some

15. a, a

16. some

17. a

18. some

19. a

20. some

21. an

22. some

23. some, some

24. a, some

25. a

26. a

27. some, some

28. some

29. a

30. some, an

31. some

32. an

33. some

34. an

35. an, a, some

36. some

37. some

38. some

39. a

40. a

41. some

42. a

43. some

44. an

45. some

46. some

47. a

48. some, some

49. an

50. some

Объяснение: