Watch the video in this chapter and fill in the blanks with what you hear. （Limit your answer within three words.)-- In the study of Oxford University in 2013, researchers found that almost 1.___________ (add a percentage here) have a high risk of being replaced by machines.-- 2,_________________ is the most powerful branch of artificial intelligence, which allows machines to learn from data and 3. ______________ things that humans can do.--Machine learning started with relatively simple tasks such as 4. _____________ risk from loan application, 5. _____________ the mail by reading handwritten characters from zip codes.