D. costly

　　6. A. drivers

　　B. teachers

　　C. firefighters

　　D. soldiers

　　7. A. habits

　　B. directions

　　C. appearances

　　D. styles

　　8. A. shooting

　　B. approaching

　　C. saving

　　D. persuading

　　9. A. gun

　　B. book

　　C. ruler

　　D. pen

　　10. A. give up

　　B. turn down

　　C. show off

　　D. look through

　　11. A. messenger

　　B. tourist

　　C. passenger

　　D. customer

　　12. A. gentle

　　B. kind

　　C. careful

　　D. timely

　　B

　　In Los Angeles, drivers spend sixty­one hours every year stuck in traffic. Professor Cyrus Shahabi also knows about traffic jams. He lives more than 65 kilometers from 1.__________ office. He is always late 2.__________ with the help of a navigation(导航) system.

　　He decided to do something for that. He developed a program called ClearPath, 3.__________ uses historical data to predict traffic conditions even before the driver leaves the house.

　　“4.__________ is unique is that we use a lot of data that's currently become available including traffic data and weather data. We analyze that 5.__________ that we can predict what's going to happen in front of you when you leave home，” said Professor Shahabi.

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