根据短文内容填空,每空一词（有题~）
When i was young,I studied___a middle school.Our headmaster(校长）was_____old man.He was kind but all of ___were afraid of him.___example,we were playing,talking and laughing___he came in.At once,the classroom became____.If a boy didn't ___his homework well or carefully,he would be very___,and asked the boy____do it again and____.