Mixed Prepositions Exercise 19

Complete the text below by choosing the correct prepositions, then press "Check" to check your answers.
For 28 years, the stark cement blocks of the notorious Berlin Wall reminded Germans and travelers Germany that they were on the front lines the Cold War. As the western city rebuilt its cement cage, a traumatized population began to express their anger in paint. What started as graffiti on an architectural scar grew extended visual commentaries on a divided nation caught in the ultimate ideological battle. And then, the battle ended. As Germans rushed to tear their symbol of division, some realized a work art was being destroyed as well - and that least part of it was worth saving.
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