为何SpeechRator觉得我的语法weak?

正义之兔2020UID：4015259

I believe that TV has had an overall positive influence on the society. First of all, for the first time in human history,people could not only hear the news but also see the live video from the field.That was a huge progress for the news agency broadcasting live news to the public. Second, TV provides abundant entertainment programs, such as TV Series,talk show, and sports event, offering public an easily access, and low-cost way to relax at home. Third, TV also supplies various educational programs, which are usually more attractive and accessible to more audience.



这是我的口语独立题，下面图片是ETS SpeechRator判分结果：



我的语法到底错在哪里？