Chief Executive Donald Tsang Yam-kuen will talk today about the row surrounding the new undersecretaries' nationalities and salaries. Mr Tsang promised yesterday that he would be ready to answer questions today after skipping two rounds of questioning in Shanghai. 'Let's talk tomorrow,' Mr Tsang told more than a dozen reporters as he began a three-day visit to Shanghai - his first official visit there since becoming chief executive. It was revealed on Thursday that five of the new deputies hold foreign citizenship. Speaking during a meeting with Shanghai Mayor Han Zheng , Mr Tsang said the city would organise a Hong Kong week in Shanghai during the 2010 World Expo. Calling the Expo the biggest event in China after the Beijing Olympics, Mr Tsang said he hoped the Hong Kong week would introduce the city's latest developments to the people of Shanghai. The city's participation in the World Expo will include exhibitions at the Hong Kong pavilion and introducing the Octopus card system in the Urban Best Practice section. Hong Kong signed the contract to participate in the Expo yesterday. During the 30-minute meeting, Mr Han said Shanghai would like to learn from Hong Kong on how to better manage airports. The chief executive will meet Shanghai party chief Yu Zhengsheng today. Mr Tsang will also visit the Expo office.