Choose the most appropriate word to complete the sentence:
______ have various safety equipment — helmets, running belays, pitons, karabiners, and so on — which is not compulsory, but which m
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Choose the most appropriate word to complete the sentence:
______ have various safety equipment — helmets, running belays, pitons, karabiners, and so on — which is not compulsory, but which most sensible climbers use.