No students are allowed to enter the room without _________ (permit).
举一反三
- No one is allowed to take the computers home without (permit) ______.
- Any visitor is not allowed to take photo without _____ (permit).
- The students leave the classroom without (permit)________.
- You can't enter the teachers' office without ____(permit).
- The students are rarely allowed to enter the teachers' reading-room.