11.   These rockets were built at a time when space technology was in its infancy.

12.   They spared no expense when the New York Public Library was built at the turn of the century.

13.   The house was built at the very top of the hill.

14.   The new airport was to be built at Chek Lap Kok, a largely uninhabited island north of Lantau island.

15.   She arrived at the Herald building at half past three, and walked past the uniformed commissionaire to the lift.

16.   The most notable examples were built at Didyma, Ephesos, Priene and Sardis.

17.   A most unusual design of aqueduct is the one built at Aspendos.

18.   The first sea-going cutter built at Rosyth Naval Dockyard has been launched by the Princess Royal.