21.  She said it was the oversight panel, not the board, that had blocked progress.

22.  Sometimes a pooling of interests can block progress.

23.  The aim of his research was to develop therapies to block the progress of infections once they begin and strategies for immunizations to prevent them in the first place.

24.  The widespread fear was that the refusal of violent groups to turn over their weapons would block all progress.

25.  Three outstanding issues are blocking progress.

26.  While US officials were cooperating with Egyptian officials, Holder said, they were not allowing them to block progress of the inquiry.

27.  Ramos said APEC members should find solutions to disagreements over agriculture, textiles and services so as not to block the progress of free trade in the region.

28.  A dispute over who will control the area has blocked progress in Israeli-Palestinian peace talks.

29.  A senior member of the U.S. delegation in Bali denied Washington was deliberately blocking progress at the talks.

30.  Although most U.N. members accept the need to reform the council, national rivalries have blocked progress.