21.   Opinion polls conducted before the vote gave conflicting predictions of the outcome.

22.   Peres and Netanyahu also ran neck and neck in public opinion surveys conducted before the vote.

23.   Security procedures are conducted before boarding.

24.   Such an experiment has never been conducted before.

25.   The attitude has altered the way he normally conducts himself before a fight.

26.   The experiment was conducted just before the Canadian national election, which was held last Monday.

27.   The panel also recommended that additional tests be conducted before putting any system in the field.

28.   The study was a so-called phase III trial, generally the last conducted before seeking U.S. Food and Drug Administration approval of a drug.

29.   The survey was conducted before the announcement by Brandeis University researchers that they had built a robotic system that designs and builds other robots.

30.   The survey was conducted before the president ordered military strikes against terrorist facilities in Afghanistan and Sudan.