Final answer:
Mr. Ross believes he cannot control what the members of The Wave do.
Step-by-step explanation:
Mr. Ross believes that he cannot control what the members of The Wave do. In the text, it is mentioned that his father formed a society called The Invincible Roughs by giving a few speeches and providing red and blue bunting for a flag. This indicates that Mr. Ross believes he can influence and manipulate the members of The Wave to some extent, but he does not have complete control over their actions. Without specific details about the context or characters involved, it's challenging to provide a precise answer. However, based on common scenarios related to "The Wave," a novel by Todd Strasser about a social experiment in a high school, Mr. Ross initially believes that he can control what its members do. As the story progresses, Mr. Ross becomes increasingly aware of the dangerous consequences of the movement he initiated, and he may shift his beliefs about control. It's recommended to refer to the specific details of the text for a more accurate understanding of the character's beliefs.