Word FormationExercise 94 of 114

For decades, (0) PSYCHOLOGISTS (PSYCHOLOGY) have been fascinated by the simple act of laughing. Although (1) .......... (LAUGH) might seem like a purely (2) .......... (HUMOUR) reaction to a good joke, research shows that it is above all a deeply (3) .......... (SOCIETY) behaviour. In fact, people are up to thirty…