31.   The threat of a severe economic slowdown, Wala said, is the greatest obstacle that could scuttle the common currency.

32.   Then, the greatest obstacle to a common currency was seen as public opinion.

33.   When a lethal virus reappears, our tendency to take flu lightly may be our greatest obstacle to stopping it.

34.   American business leaders believe corruption is the greatest obstacle to foreign investment in Africa, U.S. Commerce Secretary William Daley said Tuesday.

35.   But environmentalists depicted Washington as the greatest obstacle to decisive early action to forestall global warming.

36.   But unexpectedly, in these two chosen lands, Christianization encountered its greatest obstacle.

37.   Croatia is now the single greatest obstacle to resolving the refugee crisis, British Foreign Minister Robin Cook said during his visit to Sarajevo on Wednesday.

38.   Despite suggestions that Arafat himself was the greatest obstacle to real reform, some advocates said the aging leader should not go.

39.   Environmentalists depicted Washington as the greatest obstacle to decisive early action to forestall global warming.

40.   In South Africa earlier this week, Daley told southern African businessmen corruption was the greatest obstacle to foreign investment in Africa.