Here are suitable words that can fill in the gaps in the text:

1. **igloos**
2. **houseboats**
3. **Container homes**
4. **Treehouses**

So the completed text would read:

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In cold areas like the Arctic, you might find people living in **igloos**. They are dome-shaped houses made from blocks of ice and snow. They are cozy and help keep the people inside warm, even when it’s freezing outside!

Some people live on water in special homes called **houseboats**. These homes are like regular houses but are built on floating platforms. They can move around on rivers and lakes, offering a different view every day!

Imagine living in a house made from big metal containers! **Container homes** are created by stacking these containers on top of each other, making them a modern and eco-friendly choice for some people.

Have you ever dreamed of living in a house high up in the trees? Some adventurous folks make this dream come true with **treehouses**. They are built on sturdy branches, giving their residents a unique view of the world below.