填空题

A teacher is someone who communicates information or skill so that someone else may learn. Parents are the (41) teachers. Just by living with their child and (42) their everyday activities with him, they teach him their language, their values and their manners. Information and skills difficult or teach (43) family living are taught in a school by a person (44) special occupation is teaching.
Before 1900 it (45) widely assumed that a man was qualified to teach if he could read and write-and (46) qualified if he knew arithmetic. With modest (47) like these, it is no (48) that teachers had low salaries and little prestige. Literature and history frequently portray teacher (49) fools and ignoramuses.
By the late 19th century, there were (50) that the starts of teachers was slowly (51) Great educators such as Mann and Henry Barnard, and innovative thinkers such as Dewey and Parker began to command a (52) that in a few decades had to some (53) permeated classrooms in the United States. Progress was more glacial than meteoric, however, (54) the last half of the century.
In the 20th century the starts of teachers rose as the standards (55) their education rose. By 1950 the average teacher had an education that greatly exceeded that of the average citizen.