41.   The houses are built on low ground.

42.   The houses are built in a semicircle.

43.   The first step in building a house is to dig the foundation.

44.   They built their house on high ground.

45.   The house was built of adobe.

46.   The houses are built on high ground.

47.   They built their house on a narrow peninsula.

48.   Needed a new load of timber to finish building the house.

49.   They built a house on the oceanfront.

50.   They built their house on bare ground.