41.  As a result, firms employing them need to recruit frequently to replace those who choose not to renew their contracts.

42.  As a result, the traditional party outfit of flamboyant cravat and tweed jacket has been replaced by the ninety-nine-pound wool suit.

43.  As a sign of his good faith, the company has agreed to replace the defective parts for free.

44.  As earthbound concrete replaced shimmering glass, so crude functionalism was to supplant soaring aspiration.

45.  As he stumbled around the far side of the breakwater, the hard sand was replaced by thick mud.

46.  As Ornithischosus increased in size its scaly skin replaced the bony armour as the danger from predators lessened.

47.  As she replaced the receiver with a sad little gesture she felt her eyes fill with tears.

48.  As the oldest trunks fall over, they are replaced by new shoots which appear continually around the base of the tree.

49.  As veteran senators and representatives with strong international experience leave Congress, their knowledge of foreign affairs is simply not being replaced.