We've now added text-to-speech (TTS) to the Space activity ("Separate the words").
If your resource has text-to-speech enabled, turn on TTS using the selector at the bottom of the screen, and click "speak" to speak the text one sentence at a time. Use the number selector to jump to a different part of the text. (After finishing speaking a sentence, the number selector jumps to the next sentence automatically, so you just need to keep clicking the "speak" button.)
Here's an embedded example for you: