根据文章内容填空，每空一词。(10分)
I'm Peter Penguin. Mary Penguin is my wife. Most of the time we live in the water. It is as cold as an icebox. We have many friends here. Our home is large. All we can see here is snow and ice. But our land is not all white. There is bright color, too. Sometimes the land looks green, or blue just like the color of the sky. In summer, the sun shines all the time. We have no night at all. Then winter comes. It is night all the time. We eat shellfish(贝壳类动物). We ride on big pieces of ice. We can't fly, but we can swim very fast. Every winter, we go back to the land. Mary lays two eggs. Then she must go back to the sea to find some food. I look after the eggs. After some time we have two babies. We are happy to see each other again.
Mary is Peter's__________.
Most of the time they live in the__________.
In summer, they have no__________at all.
In winter, they have no__________.
They're good at__________, and eat shellfish for their__________.