Fill in the Blanks (Reading & Writing)

Bridge engineers must balance strength, cost and appearance when designing a crossing over a wide river or valley. Suspension designs are often chosen for very long spans because cables can —bearbarebearingbears enormous loads without requiring supports in the water below. Engineers also model wind behaviour closely, since a bridge that is not properly —bracedbracebracingbraces against oscillation can suffer the kind of collapse that —causedcausingcausescause several famous disasters in engineering history.