I think penguins are the ................................................... birds in the world. I love them! They are friendlier than the other animals.
friendliest / most clever / cutest etc.
The .................................................... species of penguins are the Emperor, the Rockhopper and the Adélie. They are more famous than the other species.
most famous / most popular
The Emperor penguin is the ........................................ of them all. It is bigger than the other penguins.
biggest
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