完形填空

　　Having passed what I considered the worst obstacle （障碍） , our spirits 1 . We made our way towards the left cliff （悬崖） . Where the going was better, though 2 steeper （steep陡峭） . Here we found 3 snow, as most of it seemed 4 blown off the mountain. We could see 5 mountains in the distance because 6 were forming all round us.

　　About one o'clock a storm 7 suddenly. We should have noticed its coming but we were concentrating on cutting steps and before we had time to do anything, we were 8 by snow. We could not move up or down and had to wait motionless , getting colder and colder. 9 my hood （兜帽） , my nose and cheeks were nearly frozen but I dare not 10 a hand out of my glove to 11 them.

　　After two hours of this, I realized we would have to do something to 12 being frozen to death. We stood up from time to time through the snow. I had 13 the outline of a buttress （扶垛）just above us. Our only 14 was to climb up to the buttress, and dig out a platform at the foot of it on which we could put up our 15 . We climbed to this place and started to cut away the ice. At first my companion seemed to regard this situation as 16 but gradually the wind died away and he 17 up. At last we made a platform big enough to pitch the tent , and we did this as best as we could. We 18 into our sleeping bags and fell asleep , 19 that we were lucky to be still 20 .

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