英语：Unit4 Earthquakes 测试（新人教版必修1）河北地区专用

3.  You could hear water pipes cracking _____ they _____ because of the cold.

A. when; burst        B. before; were burst   C. when; were burst    D. before; burst

4.  You can hardly imagine the once clear canal _____ so seriously polluted that no fish can live

 in it.

A. have become       B. having become      C. to have become     D. to become

5.  There on the shore you can see a steam powered ship covered with dirt _____, waiting to be taken apart.

A. lay in ruins         B. lie in ruin          C. laid in ruins        D. lie in ruins

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