Are sharks dangerous to humans? They live in oceans and seas all over the world. Some sharks live near the surface, ____ live deep in the water, and others on or near the ocean floor. They are even found in freshwater, swimming ____ miles up rivers.We tend to think of sharks as big dangerous creatures. The great white is certainly fearsome. It has ____ 3000 needle sharp teeth arranged in five rows, so it can sever a man's leg in a single bite. But ____ sharks are like the great white. The pigmy shark, for example, is only about 20 centimetres in length. There are ____ 400 species of shark and ____ of these are ____ a metre in length. Although the basking shark and the whale shark grow to around 12 metres, they are quite harmless, feeding on plankton and small fish. ____ 25 species are dangerous to people. The bull shark is the one that is most likely to attack people. It swims in very shallow waters and is ____ numerous than the great white, which is very rare. ____ one hundred people are attacked by sharks each year.

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