Now what you have to understand is that __4__ many of the 46 mountains have well­marked __5__ to their summits (山顶)，others are not marked at all.You have to “bushwhack (在丛林中开路)” using a compass and a map.

　　My friends had climbed 45 of the mountains.They had just one __6__—it was the most __7__，requiring bushwhacking.A hiking path led past the base of the mountain，but from that point they were on their own.

　　Early one morning they left their __8__ and walked five miles on the hiking path to the base of a chain of mountains.When they arrived，they __9__ that they had left their compass and map in the camp.Rather than __10__ the camp，they decided to bushwhack without the compass and map.

　　For hours they __11__ uphill experiencing the enduring heat，thick bushes，and black flies.__12__，in the late afternoon they found themselves at the __13__ of a mountain successfully.They were exhausted but __14__.

　　The feeling was short­lived，however.When they looked across the valley，they __15__ another higher mountain.They had climbed the __16__ one！It was too __17__ that weekend to correct their error.They had to __18__ another four months to climb the right mountain.

　　This story __19__ us a good lesson.Often in life we put in a great effort to reach a goal.But without the right “map” and “compass”，it is __20__ to get “lost”．

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