“勤勉的”的英语？

他是勤勉的典型.He is the epitome of diligence.工业区里的灰尘使勤勉的人灰心.The dust in the industrial zone frustrated the industrious man.他对每位学生应该勤勉的焦急是相当明显的.His eagerness that every student should be diligent was quite obvious....