A task of the post office staff is to_ (class) mail according to the places it is to go
classify
暂无解析
Studentsshould（）theirowninterestsaswellasdotheirschoolwork.
I'd appreciate it very much if you could make some ________on my recent article at the conference.
Hecouldnot________histearsonhearingthathewasnotadmittedtotheuniversity