1.   Olympic officials expressed optimism that by awarding the games to China, change will follow.

2.   Organization officials expressed optimism the Supreme Court would put this case on the docket.

3.   But officials expressed cautious optimism that Guillermo Sobero of Corona, Calif., might still be alive after a search today failed to find his body.

4.   Space officials expressed optimism that cooperation would further promote world stability following the end of the Cold War.