When I learnt English, we followed the fortunes of Mr and Mrs Scott and their kids Linda and Colin (plus Toby the dog and Tibby the cat) who lived in Birmingham. For years I thought everyone in England was called Linda and Colin. The textbook had a totally insane storyline - I remember one chapter was about the TV engineer coming round and having a heart attack (and our teacher going: 'repeat after me: he had a heart attack, a heart attack, a heart attack!)