55.In winter drivers have trouble stopping their cars from（ ）on icy roads.

15.Protocol was（ ）enabled him to make difficult decisions without ever looking back.

14.Writers often coupled narration with other techniques to develop ideas and support opinions that otherwise（ ）abstract, unclear, or unconvincing.

13.Members of the Parliament were poised（ ）ahead with a bill to approve construction of the oil pipeline.

12.（ ）the attempted rescue mission, the hostages might still be alive.

11.Moving from beginning to end by order of time, narration relies on a more natural pattern of organization than（ ）.

30.A leading（ ）intelligence and operations company has released its analysis of worldwide reported incidents of piracy and crime against mariners.

29.She’s worn his designs on（ ）occasions from red carpets to movie premieres.

28.Last March the（ ）of a 19th century cargo ship was found by an underwater archaeological team.

27.The teachers’union（ ）a lawsuit against the district calling for repairing “deplorable” school conditions.

26.The school is going the（ ）mile to create the next generation of sporting stars thanks to its unique development program.