Although the small room is the large one, it is more beautifully decorated.
The problem is not _____ easy. Think _____ over.
It is so difficult a problem that _____ student in this class _____ work it out.
Mr Zhang gave all the textbooks to all the pupils , except _____ who had already taken them .
Besides Tom , ______ Crosettes have two other sons , ______ of whom are all interested in making model planes .
Shortly after the accident , two ______ police were sent to the spot to keep order .