(1) The school (that/which) he once studied in is very famous.

　　(2) The school in which he once studied is very famous.

　　(3) Tomorrow I will bring here a magazine (that/which) you asked for.

　　(4) Tomorrow I will bring here a magazine for which you asked.

　　(5) We'll go to hear the famous singer (whom/that/who) we have often talked about.

　　(6) We'll go to hear the famous singer about whom we have often talked.

　　希望對您有所幫助