非一般数学题有一半圆形拱桥,拱的跨度是AB=40米,求桥拱的弧长

非一般现在时的第三人称单数谓语动词怎么变
主语是第三人称单数不是一般现在时态谓语动词要加S么?

托福写作大神快出来,帮我改两个开头段,不过我写作挺烂的（非一般的）,
Colleges or Universities should offer more courses to prepare students for future before they start working?
In the wake of the additional employment difficulties enlarge.Some students are not content with academic subjects and demand courses contribute to their to-be job.While others fell that they do not have to think too much until some job is landed by them.But should the Universities or Colleges provide some special courses which are useful for their job for students.Although speculative knowledge has its place in hunting for a job,I am in complete agreement over this statement for the following three reasons.
Some people think university professor should spend more time doing research while others think they should spend more time educating students.What is your view?
When it comes to the statement that what should professors attach importance to,the studying or educating.There is a hot controversy.The majority hold the view that professor have to spend more time on their students,namely,education.While others claim that professors should pay more attention on researching because it is benefit for the society as a whole.I am in complete agreement over the first opinion because of the following three reasons.
第二个有点套模板的感觉，反正多多指教