Theirs is a modern love drama. They met on the Internet and fell deeply in love with each other. They shared secrets, memories, feelings—even though they had never laid eyes on each other. And now, the very technology that had brought them together was tearing them apart."Kevin" is a pleasing fellow—quick with a smile, trustworthy. A security guard for a hospital in northern Idaho, he keeps emergency room patients company and walks nurses to their cars at night. He remembers the first day he went to the Internet. It was August 1995, and the computer was in the hospital library. It wasn't long before he was spending most of his free time in front of the screen.It was purely by accident, Kevin says, that he discovered online pornography (色情内容). First he looked out of curiosity. "Each time I thought I had seen it all," he says, "some new sex practice popped up. Eventually, the online sex world came to take the place of any real-world contact with women. "I can be a little bit shy," he says, "and this was an alternative that kept me from feeling lonely."Then came a message from "Marie," a young mother of three looking for company on an Internet singles site. Kevin fired off an immediate response, and the two began a dialogue that would last two months before he made the 50-mile drive to meet her. A few months later, they were married.What Marie loved about Kevin was his kindness, his interest in her kids. What she didn't know was that every time she was reading one of Kevin's love emails, he was at the other end of the connection looking secretly at pornography sites. "I knew he was always online," Marie says. "But I thought that it was just because he was interested in meeting new people."Whenever Kevin was home, he was online, with the door closed. A few times, he called her in to look at an especially "wild" site. She was a little bothered by it but didn't worry until he turned away from her in bed. "Have you been looking again?" she would cry.By January, Kevin knew he had a serious problem. He promised that he would never use the computer at home. But there was still the machine at the hospital. Every night, he would use his master key to get into the closed library and favor his curiosity as never before. Sometimes, for his entire eight-hour work time, he would sit in front of the screen. When his bosses asked him to look in on the library, where some "unusual" computer activity had been noticed, he stopped using the computer for a month, and then headed straight back to the same place.This time, though, he walked into a trick. Earlier this summer, the hospital started using cameras and computer programs that recorded Kevin's every mouse(鼠标) click. On June 27, his bosses confronted him and took him to the police station nearby. He was kept in the station for three days. Now Kevin lives under the continual watch of his wife and his boss.4. We know for sure that by and by Kevin almost forgot his role ________ at the hospital completely.