Students classify everyday objects and substances into the three states of matter: solid, liquid, and gas.

Problem Overview:

The task is to classify the given items into three categories: solid, liquid, and gas. Additionally, you need to provide your own example for each category.

Key Definitions:

- Solids: Keep their shape.
- Liquids: Take the shape of their container.
- Gases: Spread out to fill the space they are in.

Items to Classify:

1. Carrot
2. Water vapor
3. Shampoo
4. Hot air
5. Soda
6. Paper
7. Cotton
8. Soda can
9. Syrup

Solution:

#### Step 1: Classify Each Item
We will analyze each item based on its physical state:

1. Carrot:
- A carrot keeps its shape and does not flow or spread.
- Category: Solid

2. Water vapor:
- Water vapor is a gas that spreads out to fill the space it occupies.
- Category: Gas

3. Shampoo:
- Shampoo flows and takes the shape of its container.
- Category: Liquid

4. Hot air:
- Hot air is a gas that spreads out and fills the space it occupies.
- Category: Gas

5. Soda:
- Soda is a liquid that flows and takes the shape of its container.
- Category: Liquid

6. Paper:
- Paper keeps its shape and does not flow or spread.
- Category: Solid

7. Cotton:
- Cotton keeps its shape and does not flow or spread.
- Category: Solid

8. Soda can:
- A soda can is a solid object that keeps its shape.
- Category: Solid

9. Syrup:
- Syrup is a liquid that flows and takes the shape of its container.
- Category: Liquid

#### Step 2: Write the Items in the Correct Columns
Based on the classification above, we can place the items in the appropriate columns:

- Solid: Carrot, Paper, Cotton, Soda can
- Liquid: Shampoo, Soda, Syrup
- Gas: Water vapor, Hot air

#### Step 3: Provide Your Own Example for Each Category
- Solid: Rock (keeps its shape)
- Liquid: Milk (takes the shape of its container)
- Gas: Helium (spreads out to fill the space)

Final Answer:

```
Solid: Carrot, Paper, Cotton, Soda can
Liquid: Shampoo, Soda, Syrup
Gas: Water vapor, Hot air

Your own examples:
Solid: Rock
Liquid: Milk
Gas: Helium
```

Boxed Final Answer:

\[
\boxed{
\text{Solid: Carrot, Paper, Cotton, Soda can} \\
\text{Liquid: Shampoo, Soda, Syrup} \\
\text{Gas: Water vapor, Hot air} \\
\text{Your own examples: Rock, Milk, Helium}
}
\]