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下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。（第51-65题，每题1分，共15分）
Ill Be Bach
Composer David Cope is the inventor of a computer program that writes original works of classical music.It took Cope 30 years to develop the software.Now most people cant _____（51）the difference between music by the famous German composer J.S.Bach （1685-1750） and the Bach-like compositions from Copes computer.
It all started in 1980 in the United States,when Cope was trying to write an opera.He was having _____（52）thinking of new melodies,so he wrote a computer program to create the melodies.At first this music was not_____（53）to listen to.What did Cope do？ He began to rethink how human beings compose music.He realized that composers,brains_____（54）like big databases.First,they take in all the music that they have ever heard.Then they take_____（55）the music that they dislike.Finally,they make new music from what is_____（56） According to Cope,only the great composers are able to create the database accurately,remember it,and form new musical patterns from it.
Cope built a_____（57）database of existing music.He began with hundreds of works by Bach.The software analyzed the dataa_____（58）it down into smaller pieces and looked for patterns.It then combined the_____（59）into new patterns.Before long,the program could compose short Bach-like works.They werentgood,but it was a start.
Cope knew he had more work to do-he had a whole opera to write.He continued to improve the software.Soon it could_____（60）more complex music.He also added many other composers,including his own work to the database.
A few years later,Copes computer program,calledEmmy,was ready to help him with his opera.The_____（61）required a lot of collaboration between the composer and Emmy.Cope listened to the computers musical ideas and used the_____（62）that he liked.With Emmy,the opera took only two weeks to finish.It was called Cradle Falling,and it was a great_____（63）!Cope received some of the best reviews of his career,but no one knew exactly_____（64）he had composed the work.
Since that first opera,Emmy has written thousands of compositions.Cope still gives Emmy feedback on what he likes and doesnt like of her music,_____（65）she is doing most of the hard work of composing these days!
51.A.Make B.tell C.Take D.understand
52.A.trouble B.time C.fear D.pleasure
53.A.Loud B.peaceful C.classic D.easy
54.A.Feel B.look C.sound D.work
55.A.in B.at C.with D.out
56.A.added B.left C.created D.released
57.A.Small B.huge C.Simple D.colorful
58.A.cut B.drop C.broke D.turned
59.A.parts B.programs C.ideas D.pieces
60.A.play B.hear C.collect D.analyze
61.A.stage B.process C.period D.application
62.A.ones B.cases C.others D.sides
63.A.loss B.end C.success D.rush
64.A.when B.how C.what D.why
65.A.but B.until C.so D.because