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With the world's leaders gathering in China as it hosts the G20 summit on 4 - 5 September, there is speculation about whether they will tackle their hosts about human rights. When China took Hong Kong back in 1997, it made a series of agreements which were supposed to guarantee freedom and democracy for fifty years, but many are now questioning just how good these guarantees really are. Hong Kong businessman David Mok, told the World Tonight's Paul Moss that you can see a "gradual erosion of our freedom and all our values". (Photo: A traditional Chinese junk, sailing past Hong Kong's skyline. Credit: AFP/Getty Images)