Macao's past and present in photos (6)

This combination photo shows scouts participating in the "Walk for a Million" charity activity in Macao, south China (top, Xinhua, issued on June. 18, 1999) and scouts taking oaths in an anniversary celebration in Macao, south China on Oct. 9, 2011 (bottom, photo by Cheong Kam Ka). On Dec. 20, Macao will celebrate the 20th anniversary of its return to motherland. Over the past two decades, the special administrative region has made great strides in economic development and achieved prosperity and stability under the "one country, two systems" principle. Since Dec. 20, 1999, the historic day for Macao, what has changed? And what remains unchanged? Our selection of photos present comparative illustrations of the south China city's past and present. (Xinhua)