1.

robotics will become an increasingly important field as robots gradually are introduced to the homes of the world's(population/populations).

여기에서 답이 왜 population 인가요??



2.

the new develope in the historical district strikes a good balance between ancient and modern

에서 틀린 부분을 찾는건데 the ancient and the modern이 왜 답이 되는건지도 알려주세요 ㅠㅠ