—How much is _______ for a schoolbag? —Experts say students should carry_______ more than 10 or 15 percent of their body weight.
The duties of a policeman are _____ than ____ .
The black horse is _____ of the pair .
______ professional violinist practises for several hours a day , but ______ violinist has his own way of playing the Beethoven concert .
Mr Zhang gave all the textbooks to all the pupils , except _____ who had already taken them .
Shortly after the accident , two ______ police were sent to the spot to keep order .