1. **Problem Statement:** Determine which of the given shapes (A, B, C, D) are nets of cubes. 2. **Understanding Cube Nets:** A cube has 6 faces, each a square. A net of a cube is a 2D arrangement of 6 connected squares that can be folded to form the cube without overlap. 3. **Key Rule:** The net must have exactly 6 squares connected edge-to-edge in a pattern that can fold into a cube. 4. **Analyze Each Shape:** - Shape A: Has 5 squares only, so it cannot be a cube net. - Shape B: Has 5 squares only, so it cannot be a cube net. - Shape C: Has 6 squares arranged in an L shape with an extra square attached, which is a known valid cube net pattern. - Shape D: Has 6 squares arranged in a hook-like shape, which is also a known valid cube net pattern. 5. **Conclusion:** Shapes C and D are nets of cubes because they have 6 squares arranged in patterns that can fold into a cube. **Final answer:** Shapes C and D are nets of cubes.