1.   An obstacle that seems to block progress can probably be mitigated or else circumvented by finding a molecular pathway around it.

2.   At first the negotiations proceeded under a rule of consensus, in which any government could block progress.

3.   A panel of the National Academy of Sciences said Wednesday that a lack of studies on sexual behavior and drug use had blocked progress in fighting AIDS.

4.   Bullock said he will name a task force by November to find ways of resolving contentious racial debates that he said threaten to block progress in the Legislature.

5.   But the Defense Department blocked further progress as a threat to national security.

6.   But with the scandal providing such a vivid and divisive backdrop to the campaign season, they are selling the notion that Republican zeal is blocking progress.

7.   Continuation of an unsatisfactory mandate could block diplomatic progress and hinder the delivery of relief supplies, the report says.

8.   Dissident unionists who want to obstruct its operation will fall short of the seats needed to block progress, initial returns showed.

9.   Each side is able to claim the high ground and blame the other for blocking progress, all the while maintaining a comfortable status quo.

10.   For years, Bulgaria supported the bridge, but Romania blocked progress, arguing for a crossing further downstream.