What made Mr. Keesing allow Anne to talk in the class?

Anne was able to justify herself by giving strong arguments every time Mr. Keesing gave her a topic for writing. On three occasions, Anne was asked to do so however, she managed to impress Mr. Keesing every time with her unique ideas and opinions. Finally, Mr. Keesing gave up and accepted the talkative nature of Anne and allowed her to talk in the class.