The shark is a meat- eating fish and one of the most feared animals of the sea. Scientists (56) _______ about 250 species of fish as sharks. These fish live in oceans (57) _______ the world, but they are most common in warm seas. Sharks (58) _______ greatly in size and habits. Whale sharks, the largest kind of shark, may grow 60 feet long. A whale shark weighs up to 15 tons, more than twice (59) _______ much as an African elephant. The smallest shark may (60) _______ only 4 inches long and weigh less than 1 ounce. Some kinds of sharks live in the depths of the ocean, but (61) _______ are found near the surface. Some species live in coastal waters, but others (62) _______ far out at sea. A few species can even live in (63) _______ water. All sharks are carnivores (meat- eaters). Most of them eat (64) _______ fish, including other sharks. A sharks only natural enemy is a large shark. Sharks eat their prey whole, or they tear off large chunks of flesh. They also (65) _______ on dead or dying animals. 56. A. classify B. divide C. organize D. arrange 57. A. all B. through C. throughout D. over 58. A. grow B. rise C. evolve D. vary 59. A. as B. so C. very D. exactly 60. A. stretch B. measure C. develop D. expand 61. A. some others B. others C. different kinds D. some sharks 62. A. emigrate B. exist C. dwell D. migrate 63. A. fresh B. sweet C. light D. clear 64. A. uncooked B. live C. lively D. alive 65. A. eat B. swallow C. exist D. feed