21.   Significant obstacles remain, including the reliance of many countries on the hefty fees their phone monopolies extract from foreign companies for calls completed in their countries.

22.   The deal cannot close until it is approved by the Federal Communications Commission, which is not expected to pose any significant obstacles.

23.   The debt relief effort still faces one significant obstacle.

24.   The proposed merger is also being reviewed by the Federal Communications Commission, which is not expected to pose any significant obstacles.

25.   The partners merged the operation last year into a penny-stock company controlled by Janovec, a company with significant financial obstacles of its own.

26.   The White House faces significant obstacles its privatization plan, not the least of which is swooning stock prices.

27.   They also say that the challenge to the P.B.A. executive board faces significant obstacles because the state law regulating private employee unions does not pertain to public employees.

28.   They quickly confronted a significant obstacle to making money on sales to former adversaries.

29.   But the newspaper said no deal is imminent and that significant obstacles remain that could scuttle a pact.

30.   But some significant obstacles need to be overcome.