Not so long....(17),in many countries, children went to school wearing a school...(18). Boys wore a white shirt and a tie, a dark jacket, gray pants and black shoes. Girls...(19) to wear a white blouse and a dark, knee- leangth...(20). Today, in many countries students have a very different kind of uniform. They wear tennis shoes, jeans and a t-shirt...(21) a hot day students might even come to class in a pair of.....(22). teachers in past could never have allowed these students into their class. Then, the men teachers used to wear a shirt and tie, and most....(23) teachers wore a dress or skirt. But when you look inside a classroom today, it is sometimes.....(24) to tell who are the teachers and who are the students