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.

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