Help students master the basics of science by identifying everyday items as solids, liquids, or gases.

To solve the problem, we need to classify each item as a solid, liquid, or gas. Let's go through each item step by step:

First Row:

1. Water: Water is a liquid.
2. Cube: The cube (made of plastic or another solid material) is a solid.
3. Water Vapour: Water vapour is a gas.
4. Wood: Wood is a solid.

Second Row:

5. Smoke: Smoke is a gas (it consists of tiny particles suspended in air).
6. Milk: Milk is a liquid.
7. Juice: Juice is a liquid.
8. Ice: Ice is a solid (it is the frozen form of water).

Third Row:

9. Brick: A brick is a solid.
10. Oxygen: Oxygen is a gas (when it is in its gaseous state, such as in the air or in a tank).
11. Air: Air is a gas (a mixture of gases including oxygen, nitrogen, etc.).
12. Rain: Rain is a liquid (it falls as water droplets).

Final Classification:

- Water: Liquid
- Cube: Solid
- Water Vapour: Gas
- Wood: Solid
- Smoke: Gas
- Milk: Liquid
- Juice: Liquid
- Ice: Solid
- Brick: Solid
- Oxygen: Gas
- Air: Gas
- Rain: Liquid

Summary Table:

| Item | Classification |
|-------------|----------------|
| Water | Liquid |
| Cube | Solid |
| Water Vapour| Gas |
| Wood | Solid |
| Smoke | Gas |
| Milk | Liquid |
| Juice | Liquid |
| Ice | Solid |
| Brick | Solid |
| Oxygen | Gas |
| Air | Gas |
| Rain | Liquid |

This completes the classification task. Each item has been identified and categorized correctly based on its physical state.