Not everyone has a chance to be a detective, but I got one when I was thirteen years old. It happened in 2008.

One afternoon, I was walking down the street when I saw my father’s new car. I e    65     to see my father in the driver’s seat, but to my surprise, I saw a young woman driving i    66    . “She has stolen my father’s car,” I thought. So I quickly stopped a taxi and got in. I said to the driver, “Follow that new car in front,” and I told him why.

The taxi driver had a car phone, s    67     I asked him to call the police. Soon we heard the sound of a police car. The police told the woman to stop the car using a loudspeaker (喇叭). The taxi came to a stop, too. I got out right then and said to the woman, “This is not your car. It’s my father’s car.”

The woman wasn’t w    68     at all, smiled and said, “Oh, you’re Mr Johnson’s younger son, right? I’ve seen your p    69     in your father’s office.”

Before I could say another word, the woman explained that she was my father’s new assistant. My father had asked her to take his computer to the shop to have it repaired. He lent her his car. A    70     hearing this, we called my father and he told us what she said was true. The police and the taxi driver laughed. It was both the first and the last time I worked as a detective.

When a computer works on a group of programs, it can get very hot. Cooling the computer can cost a lot. So some scientists wonder what would happen if the heat from the computer could be used.

Large Internet companies such as Google and Microsoft have thousands of computers. As these computers work out problems, they produce lots of heat, so they need huge cooling systems. These systems send the heat into the air.

A company in Holland thinks paying to make the computers work and then paying again to cool them are a waste of energy. So the company developed a special device—the e-Radiator.

Boaz Leupe, head of the company, says the e-Radiator works as a heating system and saves money. He explains that the energy is used twice—once to heat the home and once to cool the computers and that the users don’t have to pay to cool their computers.

Five homeowners in Holland are testing the heating system in their homes.

“We pay for the computer using, so in that way, homeowners get heating for free,” Boaz says.

Jan Visser is one of the homeowners. “If you use the computer more, the e-Radiator produces more heat,” he says, “it can’t provide enough heat if you don’t use your computer often.” But he is ready to try it. It’s a great help for his family.

The company says e-Radiators produce heat temperatures of up to 55℃. It says the system could save its users about $440 a year.

1. What was the experience?

2. When and where did it happen?

3. Why do you think it was …?