Помогите пожалуйста нужно слова которые в скобках изменить в Past Perfect(had/hadn039;t)

1 Mother had bought a new vacuum cleaner after she saw its advertising on TV.
2 We had learnt about this entertainment center after we watched a film about it.
3 Dad had phoned the company after he found its contacts ON the Internet .
4 Before we had visited the exhibition, we had read about it in the magazine.
5 The journalist had collected the information about the new sports center by last Friday.
6 When the sportsmen arrived in London the weather had already changed.
7 When I met this winter, he had already become famous in the world.