Bill Gates has a nice house on a hill by Lake Washington. Inside the house there are seven bedrooms, 24 bathrooms, six kitchens and six fireplaces. It even has a theatre, a library, an exercise room and a swimming pool. You can say the house is very big. However, it doesn't look so big, because a large part of it is in the hills. The house is famous for many reasons. One is its large size, and another is its amazing electronic systems  . Before a visitor goes into the house, he/she gets a chip   at the gate. The chip sends information about the visitor to the electronic systems in the house. When the visitor goes into the house, lights are on automatically  . When the visitor goes into a room, the temperature   will change to make the visitor comfortable. When the visitor goes from one room to another, he/she can hear music. Bill Gates began to build his house in 1990. It took him about 7 years to build it. Bill Gates' house is very famous. The writer gives   _   reasons.
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