1-10.BACBC BCABC
11-20.CBDAB DCADC
21-30.BCCDACCBAD
31-40 CABDCADBBC
41-50 BCDBACDBCD
51.since 52.camera 53.fat 54.prove 55.shape
56.in no time 57.take pleasure in 58.all his life 59.made a complaint 60.promised to return
附加题.1.room water 2 hot 3.extra