Directions: Read the following passages carefully and choose the best answer from the four choices given for each blank.One-room schools are part of the heritage of the United States, and the mention of them makes people feel a(n) 1 longing for "the way things were." One-room schools are a(n) 2 species, however. For more than a hundred years, one-room schools have been systematically shut 3 and their students sent away to centralized schools. As recently as 1939 there were 149,000 one-room schools in the United States. By 1970 there were 1,800. Today, of the nearly 800 4 one-room schools, more than 350 are in Nebraska. The rest are 5 through a few other states that have on their road maps wide-open 6 between towns.Now that there are 7 any left, educators are beginning to think that maybe there is something yet to be learned from one-room schools, something that served the pioneers that 8 serve as well today. Progressive educators have come up with progressive-sounding names like "peer-group teaching" and "multi-age grouping" for educational procedures that 9 naturally in the one-room schools. In a one-room school the children teach 10 because the teacher is busy part of the time teaching someone else. A fourth grader can work at a fifth-grade 11 in math and a third-grade level in English without the stigma (羞耻，耻辱) associated with 12 behind or the pressure of being skipped ahead. A youngster with a learning 13 can find his or her own level without being separated from the other pupils. In larger urban and 14 schools today, this is called "mainstreaming." A few hours in a small school that has only one classroom, it becomes clear why so many parents feel that one of the 15 of living in Nebraska is that their children have to go to a one-room school.