When you click into a unit, you'll notice a section headed "Practice with a Story".
The 'Story' section contains extension material that reinforces what you've learned over the lessons in the unit.
It also introduces additional vocabulary relevant to the topic. This section trains your reading and listening skills by asking you to answer questions based on the 'Story' content. It also gives you the chance to record yourself reading along with native speakers.
Boost your learning by practicing your new vocab and grammar knowledge in context!