Workers are busy with tail-in work of Thailand pavilion at the expo site in east China's Shanghai, April 5, 2010. With the opening of the Shanghai World Expo drawing near, the construction of exhibition pavilions and facilities has almost winded up. Offering the largest-ever exhibiting area of 5.28 square kilometers in the World Expo history, the six-month expo from May 1 to Oct. 31 is expected to attract about 70 million visitors from home and abroad. (Xinhua/Pei Xin)