11.   There are serious obstacles to obtaining sufficient funding.

12.   The Church of England put a serious obstacle in the path of women who want to become priests.

13.   The agreement removes the last serious obstacle to the signing of the arms treaty.

14.   Although Powell said he had been promised that the bridge would open on Sunday, distributing the aid beyond the northern border region remained a serious obstacle.

15.   At the same time several pioneers in the field say Microsoft may face serious obstacles it has not yet conquered.

16.   Both companies said that serious obstacles to achieving a final settlement remain.

17.   But a martyred Hitler might well have been a serious obstacle to that process.

18.   But agency officials and environmentalists said they did not expect that requirement to pose any serious obstacle, noting that Congress has extended its deadline on arsenic several times.

19.   Building the camps has presented serious obstacles on their own.

20.   But before any of the changes can occur or the city can see any of the money, a number of serious obstacles must be cleared.