1.there are ... than 350 different kinds of sharks, such as the great white and whale sharks (many)

2.fossils show that sharks ... for 420 million years , since the early Silurian (exist)

3.the fins of sharks... for stabilizing,steering , lifting and swimming(use)

4.some new kinds of sharks ... over the past ten years (find)


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1. more 2. have existed 3. are used 4. have been found