21.   Experts say that difficulties in recruiting participants in clinical trials are seriously impeding progress in efforts to conquer many major killing and crippling diseases.

22.   Fowles is also writing a new novel, which he hesitates to discuss at length out of fears that talking about it will somehow impede its progress.

23.   Going on the disabled list is going to impede his progress.

24.   He also said Gingrich was ignoring how racism impeded black progress.

25.   He said such issues should be considered separately so as not to impede progress toward a strongly worded treaty.

26.   Health care, Rudman said, presents an illustration of how politics has come to impede progress on issues of national importance.

27.   How did it feel, knowing the opponent was coming and there was little you could do to impede its progress?

28.   If progress is impeded, a foul be will called.

29.   In addition, old rules against grabbing, holding, impeding progress away from the ball and setting illegal screens are being more strictly enforced.

30.   In the past, the rule was only enforced if a defensive back impeded the progress of the receiver.