Hi everybody ,many great thanks for every body here,your efforts and your answers are splendid ,but,we should know the difference between
which) and (where) :We use (which) after any place to show the discription of it.Let me elicitate the example above :The house which I bought has three rooms.this example shows the discription of the place.When we use (where) after any place ,we point out that place we work or live in regularly.(ATTEND) WITH PLACE MEANS GO THERE REGULARLY So the answer will be (where) as you go there regularly .you may work there or study there.Thanks for eveyone