teacher's desk or teachers' desk?teacher's office or teacher

teacher's desk or teachers' desk?teacher's office or teacher teacher's desk还是teachers' desk teacher's desk和teachers' desk teacher's desk and teachers' office 为何单、复数不同 讲台的英语是teachers' desk还是 teacher's desk What's on （ ）desk?A.teachers B.teacher's C.the teacher's teacher”sdesk还是teachers”desk This is s（） a.teachers'desk b.teacher desk c.t students (s...)cards or flowers to their teachers on Teacher 教师节的英文是Teacher's day or Teachers' day happy teacher's day or happy teachers'day The teacher's desk is y_____,