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

A．To put the homework on Don’s desk.
B．To leave the master key for Don.
C．To give Don’s students the next assignment.
D．To call Don at the end of the afternoon,

A．Because she cannot find a husband for herself.
B．Because the female spider is larger than the male one.
C．Because the female spider often eats her husband.
D．Because she is a black female spider.