Questions 19 to 21 are based on the conversation you have just heard.

A．There were over 100 talks given by authors.
B．Food was forbidden at this festival.
C．It was not so successful as expected.
D．There were 280 exhibitors.

A．They invite new ideas with great enthusiasm.
B．They give quick reactions to proposals and ideas.
C．They choose good ideas through a strict process.
D．They have no standard regulations on assessing suggestions.