Wallabies squeeze through to semi-final with Pumas

By Rex Gowar LONDON (Reuters) - Completion of a southern hemisphere sweep of the Rugby World Cup quarter-finals took some unexpected twists and turns before Australia edged Scotland in a dramatic finish at Twickenham on Sunday to line up a semi-final clash with Argentina. The Pumas, seen as the least likely to reach the last four before the weekend, scored four tries in a convincing 43-20 victory over injury-depleted Ireland in Cardiff before the Scots threatened a big upset in London. Scotland,