选课场景

drop class, class meets, take a course, choose course, high requirement, optional course, hard to follow

听课场景

Late for class , miss/attend the lecture , presentation , briefing, assignments, interesting, boring, topic , copy

作业场景

collect data, report, deadline, draw near, ask for extension, finish, due, submit, project proposal , search, research

考试场景

Pass, credits, exams, fail, congratulations, cheer up

买书、读书、借书场景

out of print, read selectively, novel hard to follow, reference books, check out ,return a book, lend textbooks