US Secretary of State Hillary Clinton(R) swears in Gary Locke(L) as his wife Mona holds the Bible to become the first Chinese-American to serve as US Ambassador to China August 1, 2011 during ceremonies at the US Department of State in Washington, DC. [Photo: CFP/AFP]

 

In the evening of August 12, 2011, Gary Locke, accompanied by his wife Mona Lee and three children Emily, Dylan and Madeline, arrives at the Beijing International Airport for taking office of the US ambassador to China.[Photo: 163.com]

 

The new US ambassador to China, Gary Locke (R), and his wife Mona walk out to meet the press in the courtyard of his residence in Beijing on August 14, 2011. Locke resigned as US commerce secretary to became the US ambassador China. Sworn in by Secretary of State Hillary Clinton who alluded to the challenges he will face, Locke, the first Chinese-American to hold the prestigious post, said both the United States and China had much to gain from each other. [Photo: CFP/AFP]

 

Gary Locke, accompanied by his wife Mona Lee and three children, addresses a press briefing in the courtyard of his residence in Beijing on August 14, 2011. [Photo: CFP/AFP]

 

US Vice President Joseph Biden, (C) walks behind US ambassador to China Gary Locke, (R) as they arrive at a local restaurant for lunch in Beijing, China, 18 August 2011. [Photo: CFP]

 

Gary Locke (L) visits his ancestral home in Taishan City in south China's Guangdong province on Nov 4, 2011. [Photo: 163.com]

 

Gary Locke visits his ancestral home in Taishan City in south China's Guangdong province on Nov 4, 2011. [Photo: 163.com]

 

Gary Locke paints with students at an international school in south China's city of Guangzhou on Nov 4, 2011. [Photo: 163.com]

 

Gary Locke is invited to kick off a local basketball game in northeast China's Liaoning province on Nov 9, 2011. [Photo: 163.com]

 

Chinese President Hu Jintao (R) meets with US Ambassador to China, Gary Locke, on May 4, 2012 in Beijing. [Photo: 163.com]

 

US Ambassador to China, Gary Locke, visits a GM Motor seller in Shanghai on Oct 13, 2011. [Photo: 163.com]

 

US Ambassador to China, Gary Locke (C), attends the opening ceremony for the bizjet base at Shanghai Hongqiao Airport on April 16, 2013. [Photo: 163.com]

 

US Commerce Secretary Gary Locke rides on the MTR (Mass Transit Railway) train in Hong Kong on May 17, 2010. [Photo: CFP/AFP]

 

Gary Locke, the Governor of Washington State and his wife Mona Locke arrive at Jilong Village where they visited their ancestral home 11 October. Gary Locke is on a one-day private visit to his great-grandfather's Taishan hometown in China's Guangdong province. [Photo: CFP/AFP]

 

Gary Locke (C), the Governor of the State of Washington State of the United State, and his wife Mona Locke wave to the residents of his great-grandfathers hometown in Taishan 11 October. Gary Locke is on a one-day private visit to his hometown in China's Guangdong province. [Photo: CFP/AFP]

 

This picture taken on June 28, 2013 and released by the US embassy in Beijing shows US Ambassador to China Gary Locke (L) visiting Ganden Monastery in Lhasa, China's Tibet Autonomous Region. Locke's trip lasted from June 25 to June 28. [Photo: CFP/AFP]

 

This picture taken on June 28, 2013 and released by the US embassy in Beijing shows US Ambassador to China Gary Locke (2nd R) visiting Ganden Monastery in Lhasa, China's Tibet Autonomous Region. Locke's trip lasted from June 25 to June 28.