31.  The author gives an example to explain that it not common students listen attentively.

32.  Based on the example the author gives us, we can recognize the recent phenomenon in college that there existing serious problems between learning and teaching methods.

33.  At last, the author give much advice to solve the problem.

34.  At last, the author give much advice to solve the problem.

35.  Firstly, the author give us an example of his teacher.

36.  In addition, aimed at the profit and saving trouble, the administrators still hold the way to educate, which is the reason given by the author.

37.  Although the author doesn't give an exact conclusion, I believe that animals do have the ability to think as human beings.

38.  In the first place, the author give us invalid examples to show the improvement of productivity, since he does not tell us whether the companies he mentions are comparable to Acme Publishing Company.

39.  In addition, the author does not give us the precise statistics about how much the benefit will be if buying the course.

40.  The argument seems reasonable, but we should notice that the assumptions in the argument are all given by the author subjectively without giving enough evidence.