开头和结尾范例：
开头：
It is not rare to see many students dozing off or doing other things while the professor is trying his best explaining a theory. Most people claim that this phenomenon results from the severe school attendance rule and suggest that students should be given more right to decide which class to attend according to their own interest and their judgment of the value of the class. This idea is strongly opposed by numerous people who hold the opinion that it is the fault of the students that leads to the current problem. They stand on the ground that students do not really know what they are particularly suitable to make research on and what kind of class is remarkably valuable. Consequently they think highly of the rule that students should attend all the classes. As far as I am concerned, strict school attendance really benefits the students in not only acquiring knowledge but also their social skills. 
 
结尾：
Students are the future masters of the world. Only when they have accumulated abundant knowledge and tactful social skills can they be confident to say they are fully prepared to manage the world.  Strictly required school attendance is one of the best approaches to helping students accomplish the two. While at the same time schools should also take measures to draw the attention from all students and improve the quality of teaches’ lectures to be appealing to all students.