Questions 11 to 18 are based on the conversation you have just heard.

A．All dictionaries before 1750 were not valuable.
B．In the Oxford Dictionary, its word histories is the most important part.
C．Every author after Robert Cadre benefited by the previous authors’ experience.
D．The value of a dictionary lies in the number of words collected in it.

A．There was not enough maintenance.
B．People didn’t care whatever mess it might be.
C．Because there were no effective regulations over visitors.
D．Because it was constructed badly.