完形填空

　　It seemed that nothing had happened when dawn came. But they soon  1 that the entire boat was surrounded in ice. The captain had fallen asleep behind, so the rest of the crew hurriedly woke him. He took a small axe with great care,  2 make a hole  3 the deck (甲板) , and he began to knock the ice away. From time to time a wave burst over the boat and swept over him but he  4 on working for ten minutes  5 the others looked  6 anxiously. By this time he was so cold that he could  7 trust his grip (紧握力) or balance.

　　Each member of the crew took the axe in turn to cut the ice away for  8 he could bear it. First, they  9 knock off enough ice to get on their knees. Standing up on that rolling deck would have been committing suicide (自杀) because a man who had fallen overboard  10 .

　　Then the captain discovered that ice was  11 inside the cabin (船舱). He  12 one of the crew and together they  13 to get the stove  14 in the hope that it would  15 enough heat to warm the cabin above freezing point. Unless the ice in the bottom could be melted enough so that it could be pumped out, they were in danger of  16 .

　　It  17 an hour's work before the boat began to float better. But during this time they succeeded in getting rid of most of the ice.

　　Throughout the afternoon, the coating of the ice began to build up again  18 they tried their best. In the face of this new danger, Captain Slater decided that it was much too dangerous to gamble (孤注一掷) on the chance  19 the boat would survive (幸存)until the next morning. Once more, he ordered the crew to clear ice. Then they settled down to wait for  20 day.

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It is wrong to set the fallen leaves ________, for they give off poisonous gases.

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A.　　  heating　　   　　　　　　   　　　　　　  

B.　　  to be heated

C.　　  heated　　   　　　　　　   　　　　　　  

D.　　 being heated