第 一 练：CAA
第 二 练：CCBBDC 160 3V/S 3
第三练：CCAADABCDC ACBDBDDABDBADAADCBDA CADB DCBA DAAD does it make a difference /absorbed in /are to blame for /suspected to steal /expose to /the affected /attended to /next time you visit /that the sorce of water should be examined /that he would face
第 七 练：DCD
第 八 练：AADCDCBB 16，π,6
第九练：ABBBCCBCAC CBCADBDCBBCBDDBDADBC CCBC AAAB AACC Having said/worried about/built /borrowed from /that was advertised /taken to the seat /to complete /to be served /that can reduce /that need be taken
第 十 练：DCCA
第 十一 练：BBDCDAC [0,1] x+y-3=0 A (1,14)B(-7/2,-16) C(9,8)
第十二练：CCDBDDBADD DCBBBACCBCDBBCACABCD CABA DADC BCAC/is he good at /has she missed /did I know /did the train arrive /had taken the /dark was it /flew the birds /be discussed /supposed to be feared /to swim
