Proper arrangement of classroom space is important to encouraging interaction. Today’s corporations hire human engineering specialists and spend a considerate number of time and money to make sure that (1) ______ the physical environments of buildings are fit for the activities of their inhabitants. College classroom space, however, should be designed to (2) ______ encourage the activity of critical thinking. We are approaching to (3) ______ a new era, but step into almost any college classroom and you step back on time at least a hundred years. Desks are normally in (4) ______ straight rows, so students can clearly see the teacher but not their (5) ______ classmates. With a little imagination and effort, if desks are fixed to the floor, (6) ______ the teacher can correct this situation and create space what encourages (7) ______ interchanges among students. In small or standard-size classes, chairs and desks can be arranged in various ways: circles, U-shapes, or semicircles. The primary goal should be for everyone to see everyone else. Larger classes, particularly those hold in lecture halls, unfortunately, allow much (8) ______ less flexibility. Arrangement of the classroom should also make it easy to divide students into small groups for problem-solving exercises. Small classes with moving desks and tables present no problem. Even in large lecture (9) ______ halls, it is possible for students to turn around and form groups of four to six. Breaking a class into small groups provides many opportunities (10) ______ for students to interact with each other.