Listen to the passage and fill in the blanks with the missing information. College professors seem to teach few classes but they actually lead 1 . Every week the average professor spends between 2 hours in the classroom but works from sixty to eighty hours. Professors spend part of that time 3 because they must 4 in their fields. After reading, they will work on their class lecture notes to 5 them. Besides, they must grade papers, prepare their lessons, write articles and books, or work on various projects. So, college professors have very full schedules.