39. A - caught
40. B - we did
41. C - these modern ideas
42. B - is
43. D - diary
44. A - if
45. C - helps a person
46. A - you don't let
47. B - when
48. A - it's
49. D - somewhere
50. C - in order to? (здесь вообще не увидела ошибки, но как вариант)
51. C - wait for favourable
52. D - me constcntly interrupting him