Some American soldiers was marching forward among snow-covered 76. ______ mountains. As he could see nothing but snow, they soon became snow 77. ______ -blind. They had no choice but to stop go forward under such a difficult 78. ______ condition. They put up the tent so as to spend the night there, but hardly 79. ______ had they put up the tent when a gust of wind sent the tent going far away 80. ______ As they had never meet with such a problem, they didn’t know how 81. ______ to deal with it. Lucky they were equipped with a radio transmitter, with 82. ______ which they got touch with their commander, who immediately sent 83. ______ out a helicopter to saving them. All the soldiers let out a shout of joy 84. ______ when they got into the helicopter safe. 85. ______