Read the text on this website. Try to tell others without spoken words as much as possible about these topics. You can write words or draw something on paper and show it to the camera or show it with gestures or make a role play. After 3 min, make a small summary (with words) of what you showed. Be creative and cooperate. You can also do it parallel: one person shows a topic and the other person explains it in words. If you show something on the screen, tell your audience to turn off their microphones and switch to speakers view in zoom.