Here are the tag questions for each statement:

43. You didn't take part in the competition, did you?
44. She can ride to school by herself, can't she?
45. My friends are used to swimming in the river, aren't they?
46. His mother doesn't work for that company, does she?
47. They don't have to buy new dictionaries, do they?
48. It will rain tomorrow, won't it?
49. Remember to buy your mother some sugar on your way home, won't you?
50. She has read this news on the internet, hasn't she?
51. They have seen lots of Beckham's pictures on his website, haven't they?
52. You think Internet is a means of education, don't you?
53. There was a lot of traffic in the streets yesterday, wasn't there?
54. You ought to go now, shouldn't you?
55. I think she won't come to your party, will she?
56. What a nice dress, isn't it?
57. It is time for you to study hard, isn't it?
58. You need go right now, don't you?
59. He never studied hard, did he?
60. I am not sure it is going to rain, am I?
61. He said that his father was a doctor, didn't he?
62. Everything is all right, isn't it?
63. She is nobody at the party, is she?
64. Don't forget to turn off the lights before going out, will you?
65. Be careful with that man, will you?
66. Someone had come to our room, hadn't they?
67. She likes nobody to help her, does she?
68. Today is your birthday, isn't it?
69. Daisy always drinks a cup of tea after lunch, doesn't she?
70. Coffee and beer aren't good for children, are they?
71. Children don't smoke cigarettes, do they?
72. I am late for the appointment, aren't I?
73. You could help him to do that, couldn't you?
74. They ought to go, shouldn't they?
75. You haven't just met her, have you?
76. He used to smoke cigars, didn't he?
77. Your teacher has a new car, doesn't she?
78. You have never been there before, have you?
79. Someone broke that vase, didn't they?