Google already has a window into our souls through our Internet searches and it now has insight into our ailing bodies too. The Internet giant is using its vast database of individual search terms to【C1】______the emergence of flu up to two weeks【C2】______government epidemiologists. Google Flu Trends uses the【C3】______of people to seek online help for their health problems. By tracking【C4】______for terms such as "cough", "fever" and "aches and pains", it claims to be able to【C5】______estimate where flu is【C6】______. Google tested the idea in nine regions of the US and found it could accurately predict flu【C7】______between 7 and 14 days earlier than the federal centres for disease control and prion. Google hopes the idea could also be used to help【C8】______other diseases. Flu Trends is limited【C9】______the US. Jeremy Ginsberg and Matt Mohebb. Two software engineers【C10】______in the project, said that【C11】______in Google search queries can be very 【C12】______. In a blog post on the project they wrote: "It turns【C13】______that traditional flu surveillance systems take 1 to 2 weeks to collect and【C14】______surveillance data but Google search queries can be【C15】______counted very quickly. By our estimates【C16】______each day, Flu Trends may provide an early-warning system for outbreaks of influenza." They explained that【C17】______information health would be kept【C18】______. "Flu Trends can never be used to identify individual users【C19】______we rely on anonymised, aggregated counts of how of ten certain search queries【C20】______each week." 【C14】