News At Seven-Thirty: fourth secondary school under suspension because of H1N1; leap hole was found in new plastic bag levy system; teenage girl was found conscious outside a housing complex in Tuen Mun; Iran widens its crackdown on online communications; U.S. said North Korea poses a "grave threat" to the world; Leung Kwok-hung led a protest in The Link’s Admirity office; Legislative Council is trying out new, enhanced security measures; HK government warned fung shui consultants not to evade tax.