Peter won’t go with Julia because ______.

M: Hello, Julia. Why are you in such a hurry?
W: Hello, Peter. I’m going to the theatre. They say there’s a lecture on how to improve the skills of listening. Do you want to go with me?
M: Oh, no. Thanks. I heard it yesterday.
W: Really? What did you think of it?
M: I liked it, but I was sorry to have missed the first part.
W: Oh, what happened?
M: I was held up on the way. So by the time I got there, the second part was just beginning.
W: What a pity! But I’ll tell you about it after I hear it.
M: Thanks. I hope you’ll enjoy it.