根据以下材料，回答1-20题
Watchdogs are growling at the web giants, and sometimes biting them.In April ten privacy and data-protection commissioners from countries including Canada, Germany and Britain wrote a public letter to Eric Schmidt, Google's boss, demanding 1 in Google Buzz, the firm's social-networking service, which had been criticized for dipping 2 users' Gmail accounts to find "followers" for them without clearly explaining what it was doing.Google 3 complied.
Such run-ins with regulators are likely to multiply—and 4 the freedom of global Internet firms.It is not just that online privacy has become a/an 5 issue.More importantly,privacy rules are national, 6 data flows lightly and instantly 7 borders, often thanks to companies like Google and Facebook, which 8 vast databases.
A recent scandal known as "Wi-Figate" 9 the problem.Google (accidentally, it insists) gathered data from unsecured Wi-Fi networks in people's homes as part of a 10 to capture images of streets around the world.A number of regulators 11 investigations.Yet their reaction 12 widely, even within the European Union.Some European watchdogs ordered Google to 13 the data it had collected in their areas；others 14 that information related to their countries be destroyed.
Despite such differences within Europe,the 15 is much greater between Europe and America.European regulations are inspired by the 16 that data privacy is a 17 human right and that individuals should be in control of how their data are used.America, 18 , takes a more relaxed view, allowing people to use consumer-protection laws to seek compensation if they feel their privacy has been 19 .It is this difference that explains why Silicon Valley firms that 20 abroad have sometimes been the targets of European Union data watchdogs.
第13题答案是

A process

B restore

C exploit 

D preserve