(二)综合填空：根据短文意思，用方框中所给词语的适当形式填空，使文章通顺、完整(其中有两个多余的)。
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warm, call,
light, but, danger, above, believe, sink (下沉), must, land, towards, try |
Not many people have seen icebergs (冰山). Sailors (船员) sometimes see them but they (76) __________ to keep away from them. We call the top and bottom (底部) of the world the North and South Poles (极点). There is ice over the sea and the (77)__________. The ice is often thousands of meters thick (厚). The ice often moves slowly down (78)__________ the sea. Then big pieces of ice break off and float (漂浮) on the sea. We (79)__________ these big pieces “icebergs”.
Most of an iceberg is under the water. Ice is only a little (80)__________ than water. The top of an iceberg may not be near (81)__________ a ship, (82)__________ the ship hits the iceberg below the water. Then the ship (83)__________. Sometimes the water becomes (84)__________. The bottom of the iceberg becomes smaller and smaller. Then it turns right over. Sometimes it hits a ship. Icebergs are often very beautiful but they are also (85)__________.