61.   But the major obstacle to opening the bridge remains concerns about the lax security on the Afghan side.

62.   But the officials acknowledged that they must overcome several major obstacles before construction can begin.

63.   But the Republican drilling foes are proving a major obstacle.

64.   But there are signs that the fund-raising drives that will begin next month face major obstacles in matching the latest results.

65.   But this thicket of rules presented a major obstacle to the development of universal grammar.

66.   By most accounts, the major obstacle confronting Wilson is local, not national.

67.   Cancer costs have turned the mundane money matter of a car payment into a monthly major obstacle.

68.   China cleared a major obstacle Thursday by releasing Harry Wu, an American citizen and human rights activist who was tried and convicted for spying in that country.

69.   Cost is one major obstacle to extending the calendar.

70.   Cost is a major obstacle to more widespread use, Reed said.