Fill in the Blanks (Reading & Writing)

Mountain rescue teams must reach stranded hikers before deteriorating weather makes helicopter access —impossibleimpossiblyimpossibilityimpossibleness. Volunteers often trek for hours across difficult terrain, carrying equipment heavy enough to —sustainsustainablesustainingsustainment a full medical response on site. Because conditions can change so quickly, rescue coordinators insist that speed and caution be —carefullycarefulcarecarefulness balanced.