News At Seven-Thirty highlights:Government announces launch of inflation-linked investment bond;Ombudsman to launch investigation into booking of LCSD sports facilities;Public consultation on replacement mechanism begins in two weeks;David Cameron makes unannounced visit to Afghanistan;Dominique Strauss-Kahn faces new sex assault allegations;Festivities across America mark the 235th Independence Day celebration.;Results came out this morning for this year’s secondary school places allocation;Three TVB employees testified at the District Court today in the corruption trial involving the station's general manager, Stephen Chan;Prince William performs water landing during Canada tour;Xiamen Zoo shows off foal that's a cross between zebra and donkey.