1.be done;
2.hit;
3.were built;
4.will be;
5.is being built;应该是这样断句吧：Great changes have already taken place in Yancheng.A second expressway(高速公路)___ (build) through the city \a few years after the first one was done.
6.didn't
be done
hit
was built
will be
(是through还是though啊？！)was built/had been built（i am not sure）
did not own
1\be done
2\hits
3\had built
4\would be
5\built
6\haven't owned
have done
had hitted
had built
will be
had built
haven`t owned
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