A few weeks ago DDeubel published an interactive book with a selection of activities from English Central specifically aimed at developing the oral skills for elementary students.
The layout of the exercises is really simple: First students listen to a short model video. Then, they perform the dialogue themselves by personalising the information on the video. Finally, they do a short vocabulary activity to consolidate all the contents they have just seen.
This is an interesting, motivating, engaging and structured way to develop conversational skills for lower level students.
You can also download the interactive book in PDF format from here.