Indeed, not all of the vocab sections on this page had the audio enabled and I have now made the relevant change. I have taken advantage to order the words a little more intuitively.
As with the French phrases pages generally, the pronunciations are produced by an (albeit realistic) text-to-speech system. Such systems are primarily designed to read whole paragraphs of text and one or two of the pronunciations could ideally be tweaked a little more. So I will also be looking at the possibility of recording these words and phrases with a French speaker, as has already been done with the 200 or so pronunciations included in the site's French dictionary.