HELP ME HELP ME PLEASE

2 Marina d'Or, which is famous for its sea-water spa, is one of the biggest holiday complexes in Europe
3 MP3 players, which was designed to the modern-day 'Walkman', are very popular
4 Television, which was inveted in the 1920s, relly changed the way people viewed the word
5 Muhammad Ali, who had been the best boxer in the word, has been a place ambassador for the UN