A、Because they are not satisfied with their present jobs. B、Because they are tired of the work. C、Because they can’t cooperate w

Most American university students study for 4 years or more to get a college degree. During this time, they are called undergraduate students. When a student completes his courses, he earns a bachelor’s degree which will help him find jobs.
    Many students postpone finding jobs. They stay at the university and work for a higher degree. Other students take a job for a few years. When they quit working, they resume studying at the university. These students work to earn higher degrees, a master’s or a doctorate. They are called graduate students.
    Graduate students specialize in a particular field of study. They study to become experts in this field and to learn new advances in their fields while they earn an M.A. or Ph. D. Sometimes when they get an M.A. in one field, they begin studying in another field. They hope to get jobs that are interesting and high paying.
    The life of a graduate student is often difficult. They are usually too busy studying to make a good living. Often they have to pay high tuition fees for their education. Some give up studying before they get their degrees. But most keep on working at their studies until they graduate. In today’s world, most graduate students don’t regret spending time on their studies. They are finding that things are changing very fast and study has become a necessity.