填空题

Seals (36) so many needs of the people who live in the Far North. The meat of the seal is a (37) source of food. Oil from the blubber, or fat, becomes (38) . Seal oil, when set on a fire, maintains a steady flame. Sealskins are made into boots and other articles of clothing. The bones become (39) or tools. No part of the animal goes to (40) . The number of seals (41) greatly in different parts of the arctic. Wherever there are strong ocean currents, resulting in broken (42) you will find an (43) of these animals. (44) . Arctic seal hunting has been an active industry since the early part of the nineteenth century. (45) .More than 500,000 animals are killed each year by hunters operating in the main sealing grounds. (46) .