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   Modern zoos are very different from zoos built fifty years ago. At that time, zoos were places ¡¡¡¡¡¡¡¡(1) people could go to see ¡¡¡¡¡¡¡¡(2) from many parts of the world. The animals lived in cages with iron bars, which were easy to keep clean. ¡¡¡¡¡¡¡¡(3), for the animals, the cages were small and impossible to hide in. Although the zoo keepers took GREat ¡¡¡¡¡¡¡¡(4) of them, many of the animals did not ¡¡¡¡¡¡¡¡(5) comfortable, and they often became ill.

   In modern zoos, people can see animals in more natural conditions. The animals are given more ¡¡¡¡¡¡¡¡(6) in larger places so that they can live more comfortably as they would in nature. Even the appearance of zoos has changed. Trees and grass grow in the cages, and water flows through the places that the animals live in. There are few bars; ¡¡¡¡¡¡¡¡(7) there is often a deep ditch(¹µ)¡¡¡¡¡¡¡¡(8) with water, which surrounds a space where several sorts of animals live together as they would naturally. In ¡¡¡¡¡¡¡¡(9) American zoo, the visitors can ¡¡¡¡¡¡¡¡________ (10) through a huge special cage that is filled with trees, some small animals and many birds, and large enough ¡¡¡¡¡¡¡¡(11) the birds to live naturally. In a zoo in New York, ¡¡¡¡¡¡¡¡_______ (12) of special night, people can observe certain animals that are active only at night, ¡¡¡¡¡¡¡¡(13) most zoos are closed. Some zoos have special places for visitors to watch animals that live in the desert, or under water. Some other zoos have special places for animals that live in cold conditions like the Arctic bear.

   Modern zoos not only show animals to visitors, but also keep and save rare animals. For this ¡¡¡¡¡¡¡¡________ (14), fifty years from now, the grandchildren of today¬ðs visitors will still be able to ¡¡¡¡¡¡¡¡(15) watching these animals.

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