Polar bears live in ____ coldest part of the world. Because they are white, ____ is difficult to see them when they are moving around on snow or on ice in the sea. ____ polar bears eat sea birds and thier eggs, and different kinds of small whales and fish. They have very strong teeth and can stand on only two legs. They are really good ____ swimming, too. Baby bears are called 'cubs'. Mothers ____ fish to thier cubs when they are small. But when cubs are three years old, they can catch fish very ____.

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