Building cross sections

This task is about drawing cross-sections of buildings.
Imagine that each of these buildings has been sliced in half downwards from top to bottom, and across from left to right. In the spaces provided, draw what these slices would look like. Some drawings have already been done for you.
a)
     cross-sections-beehive-drawing.png

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b)  The downwards slice has already been drawn.
     Draw what the across slice would look like.

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c)  Draw what the downwards and across slices would look like.

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d)  Draw what the downwards and across slices would look like.