(Page 484) "Well, I shouldn't overdo it. I don't think you ought to swim anymore today. She was ready for a battle of wills, but he gave in at once." This shows that he has matured because he doesn't argue with her. When he had demanded the goggles he argued with her and throw a fit. Now he listens to her and doesn't put up a fight. Jerry also shows mature behavior when he was determined to go through the tunnel. (Page 482) "On the day before they left, he would do it." This is an example because it shows that he was determined no matter what to go through the tunnel. Someone that was childish would've given up on going through the tunnel or just wouldn't have done