61.   This system has been replaced by strong high pressure system and very hazy conditions.

62.   When that happens, the system must be replaced.

63.   He claimed the new random tests, which replaced the previous system of targeting first-team players after matches, was beginning to reap rewards.

64.   The system is being replaced.

65.   Programmers at the time mistakenly believed their systems would be replaced by the time the millennium rolled around.

66.   Singapore announced Friday that it will build a multi-billion-dollar sewerage network cutting across the island to replace existing systems.

67.   The current tax system would be replaced by the imposition of a single tax, significant exemptions for the poor, and the elimination of many deductions.

68.   The federation wants to replace its system of regional teams, which it considers outdated, with private clubs and also plans to start a national championship.