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A. It is advisable.
B. It is wasteful
C. It is surprising.
D. It is understandable.
______ injuries makes additional safety measures necessary. Climbers will usually work in pairs and use a system of ropes and anchors
______ climbing a route with one's own hands and feet and little more than a cushioned bouldering pad for protection. This style of climbing
Many doctors have serious concerns. They say headphones ______ .