1.   Still, doubts linger that the program will be as successful as its backers claim.

2.   Although mission safety has yet to be compromised, doubts linger.

3.   Both companies say they have backed off, but doubts linger.

4.   But a terrible doubt lingers over the French ability to score.

5.   But doubts linger as to whether Fisher has the political heft to win in November.

6.   But the doubts linger.

7.   But while substantial good will has been generated by the American soldiers, doubts linger among Hungarians about the wisdom of joining NATO.

8.   Doubts still linger, however, about the new version of the allergy drug.

9.   However, doubts linger.

10.   However, while the goals set out by the United Front pleased the investment community, doubts lingered about how the government would achieve them.