听第11段材料，回答第18至20题。
18.Why didn’t the woman go to the man’s birthday party?
A、She forgot all about it.
B、She didn’t like the man.
C、She doesn’t know about it.
19.Who is the woman?
A、The man’s frienD、
B、The man’s mother.
C、The man’s secretary.
20.What does the woman want to do for the man’s birthday?
A、Buy him a nice present.
B、Have lunch with him.
C、Send him an email.