Nowadays, amateur photography has become a troubling issue. Citizens of rich countries have got used to being watched by closed-circuit cameras that【C1】______roads and cities. But as cameras【C2】______and the cost of storing data decreases rapidly, it is individuals who are taking the pictures. Some 10,000 people are already testing a【C3】______of Google Glass. It aims to reproduce all the functions of a smartphone in a device placed on a persons nose. Its flexible frame. holds both a camera and a【C4】______screen, and makes it easy for users to take photos, send【C5】______and search for things online. Glass may fail, but a wider revolution is under way. In Russia, where insurance【C6】______is common, at least 1 million cars already have cameras with them that film the road ahead. Police forces in America are starting to【C7】______officers with video cameras, pinned to their uniforms, which record their interactions with the public. Widespread recording can already do a lot of good. Car-cams can help resolve insurance claims and encourage people to drive better. Police-cams can discourage criminals from making groundless complaints【C8】______police officers and officers from【C9】______the suspects. Optimists see broader benefits【C10】______Plenty of people carry activity trackers to【C11】______their exercise or sleep patterns; cameras could do the job more effectively, perhaps also【C12】______their wearers diets. 'Personal black boxes' might be able to transmit pictures【C13】______their owner falls victim to an accident or crime. Not everybody will be【C14】______by these prospects. A perfect digital memory would probably be a pain, preserving unhappy events as well as【C15】______ones Suspicious spouses and employers might feel【C16】______review it. The bigger worry is for those in front of the cameras, not【C17】______them. The web is filled with sneaky photos of women,【C18】______in public places. Wearable cameras will make such furtive photography easier. The combination of cameras everywhere—in bars, on streets, in offices, on peoples heads—is a powerful and【C19】______one. We may not be far from a world【C20】______which your movements could be tracked all the time. 【C1】