練習一

　　present;since;doctor;pollution;open;D;A;B;A;C;B;B;AD;B;wastaught;married;swim;came;havebeen;havelived;was.

　　練習二

　　changes;seen;infact;marry;southern;hadfun;won'tuntil;havebeenmarried;haskept;differentfrom

　　AADBDABB

　　練習三

　　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

　　練習四

　　CBACCB;notarrived;yet;Howlong;heard;Haseverbeen;Haschanged;yet;

　　IhavelivedheresinceIwasborn.

　　It'spleasanttoplayChinesechesswithmyclassmates.

　　AlthoughTomwasill,hewenttoschool.

　　WhereisMarry?Shehasgonetothecinema;

　　HaveyoubeentoBeijing?YesIhave.

　　Iusedtoplaycomputergames,nowIdon'tdoit.

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