they" in the passage refers to ____.,,,,classes|instructors|students|==courses">
23
instances" mostly means ____.,,,,special types|==typical cases|excellent chances|right occasions">
37
extensive" in the passage is closest in meaning to ____.,,,,==great|maximum|full|poor">
46
educational technology" refers to ____.,,,,==electronic devices used in education|the rewritable wax tablets used in STEM|sophisticated calculators|course management software">
48