Google, the world's largest Internet search engine, signed up its first mainland reseller, China Enterprise, for its AdWords advertising service, the Standard of Hong Kong reported. China Enterprise, a provider of IT services and a subsidiary of Hong Kong-listed Sino-i Technology, will sell the AdWords service in China, targeting small and medium-sized businesses. Google, which was granted a business license to operate in China in May, ranks third in market share for mainland search engines after Baidu and Yahoo, according to research company iResearch.