The Chief Executive, Mr Chui Sai On, is to attend the opeing ceremony of World Expo 2010 in Shanghai, where he will also officiate the inauguration of the Macao Pavilion on 1 May. From Shanghai stay, Mr Chui will lead a high level official delegation to Jiangsu province where he will meet their counterparts to discuss trade co-operations and visit several economic developing zones and historical tourism attractions. Mr Chui is scheduled to depart tomorrow and return on May 3. During his absence, the Secretary for Administration and Justice, Ms Florinda Chan will be the acting chief executive.