.1.There are the boxes which we keep the paper in .
2.The chair that /which he was sitting on was broken.
3.The books that / which you are looking for are on the top shelf.
4.The window that /which the theif had climbed through was still open.
5.The dress that /which she put on was green.
二.1.The boy on the blue bike is my son.
2.The man opening the bank is Mr.Green.
3.The car on the right beiongs to Mike.
4.The bus we are on will take us downtown.