Question 13 is based on the conversation you have just heard.

W: Good morning, Mr. Lee. May I have a minute of your time?

M: Sure, Catherine. What can I do for you?

W:（12） I’m quite anxious about transferring over to your college. I’m afraid I won’t fit in.

M: Don’t worry, Catherine. It's completely normal for you to be nervous about transferring schools. This happens to many transfer students.

W: Yes, I know. But I’m younger than most of the students in my year and that worries me a lot.

M: Well, you may be the only younger one in your year. But you know, （13）we have a lot of after-school activities you can join in. And so, this way, you'll be able to meet new friends of different age groups. 

W: That’s nice. I love games and hobby groups.

M: I’m sure you do. So you’ll be just fine. Don’t worry so much and try to make the most of what we have on offer here. Also, （14）remember that you can come to me anytime of the day if you need help.

W: Thanks so much. I definitely feel better now. As a matter of fact, I’ve already contacted one of the girls who’d be living in the same house with me. And she seems really nice. I guess living on campus I’ll have a chance to have a close circle of friends since we’ll be living together.

M: All students are very friendly with new arrivals. Let me check who'd be living with you in your flat. OK, there are Hanna, Kelly and Bree. （15）Bree is also a new student here like you. I’m sure you two will have more to share with each other.

13. What does Mr. Lee encourage Catherine to do?

解析：C。根据录音可知，Mr. Lee指出学校有很多课外活动可以参加，通过参加课外活动，Catherine能结交不同年龄的朋友，因此C项正确。