Asateacher,youshouldnot_______thestudentsfromaskingquestionsinclass.
A、ruinWhathesaidinthemeeting_______everybodypresent.
The_______workcontinuedformorethanaweekbuttherewasstillnosignofthemissingboy.
Whenmakingmoderncameras,peoplebeganto_______plasticsformetal.
Thismorningintheclass,ourteacherlosthis______atlastbecausehecouldnotstandanymore.
Heworksinouruniversityasavisiting_______,notasaformalfacultymember.