News At Seven-Thirty highlights:Mainland inflation hits three-year high;Malaysian police arrest hundreds ahead of planned demonstration;World welcomes South Sudan, its newest nation;Murdoch flies to London to tackle phone-hacking crisis;Rita Fan says she will start to considering whether to run for CE election;Peng Qinghua said to support public consultation for replacement mechanism;Elderly woman with joint disease sues building for failing to provide lift access;Taxi drivers salaries take a hit after fare hike;Copper stolen from various places around town;Relatives of deceased construction workers visit the site of the accident;Betty Ford dies at 93.