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练习一 present;since;doctor;pollution;open;D;A;B;A;C;B;B;AD;B;wastaught;married;swim;came;havebeen;havelived;was. 练习二 changes;seen;infact;marry;southern;hadfun;won'tuntil;havebeenmarried;haskept;differentfrom AADBDABB 练习三 possible;service;althgough;attraction;present;have;since;Howmany;Whenbuy;Havecarried;been;hasn't;sad;去掉but;yet;nextto;hasbeenopened;anylonger;howtoget;It'storead;Itiscame;butcame;haveknown;arefondof 练习四 CBACCB;notarrived;yet;Howlong;heard;Haseverbeen;Haschanged;yet; IhavelivedheresinceIwasborn. It'spleasanttoplayChinesechesswithmyclassmates. AlthoughTomwasill,hewenttoschool. WhereisMarry?Shehasgonetothecinema; HaveyoubeentoBeijing?YesIhave. Iusedtoplaycomputergames,nowIdon'tdoit. | 
