填空题

Educators are seriously concerned about the high rate of dropouts among the doctor of philosophy candidates and the consequent loss of (36) to a nation in need of Ph. Ds. Some have placed the dropouts loss as high as 50 percent. The (37) of the loss was, however, largely a matter of expert (38) . Last week a well-rounded study was published. It was based on 22000 questionnaires sent to (39) graduate students who were (40) in 24 universities and it seemed to show many past fears to be (41)
The dropouts rate was found to be 31 per cent, and in most cases the dropouts, while not completing the Ph. D. requirement, went on to productive work. They are not only doing well (42) , but, according to the report, are not far below the income levels of those who went on to complete their doctorates.
Lack of motivation was the (43) reason for dropping out. Most dropouts went as far in their doctoral program as was consistent with their levels of ability or their specialities. (44) .
Nearly 75 per cent of the dropouts said there was no academic reason for their decision, (45) , uncompleted research and failure to pass language exams. (46) was marked by 19 per cent.