Artificial intelligence(人工智能), or AI in short, is the science of giving computers and machines ability to think and work like humans.

AI scientists and engineers have made a lot of cool technologies.AI is rapidly catching up_____ the human ability to read faces.As a result, facial recognition(识别)____ a lot in the world.Chinese police use this technology to identify criminals(罪犯). Once they caught a criminal when he attended _____concert.____ also checks the ID of ride-hailing(网约车)drivers and lets people pay for things with a smile.

AI is also used in self-driving cars_____ are believed to be the future of driving. Most drivers may wave or nod at passers-by to let them cross the street, but self-driving cars don't have this_____.Carmakers are testing a light signal system to help them“speak" to humans. The system can show_____self-driving cars will do. For example, if a driverless car is yielding(让路)，it will flash two white lights side to side.A rapidly flashing light tells passers-by that the car is about to speed up.

Service Robots also show you how_____ AI is. Imagine this- you come back home from school and your robot housekeeper is waiting for you at the door. After dinner, he teaches you____ the piano, just like a real music teacher.Such thoughts will soon happen in the real world.In the future,_____ service robots will become good home helpers.

AI is so powerful that it can help human beings and even replace us in many jobs.