December 12, 2013 - 4:22PM Stocks to watch on the Australian stock exchange at close on Thursday: GNC - GRAINCORP - down two cents, or 0.2 per cent, at $8.20 Vodafone Australia boss Bill Morrow will take over as chief executive of NBN Co in 2014, Mr Morrow, halfway through a three year program to turn around the telco's disappointing performance. Singapore Airlines, Etihad Airways and Air New Zealand will increase their stakes in Virgin Australia to almost 70 per cent as part of a $351.5 million capital raising.