Question number 2 to 4 is based on the following conversation.

(at the break time)
Amanda : “Hi, Sammy …”
Sammy : “Hi, Amanda. How are you today?”
Amanda : “I am really good. And you?”
Sammy : “Well, I am fine but I am a little bit nervous.”
Amanda : “Why?”
Sammy : “My class is going to have speaking test in English today. I don’t know if I can do it. I haven’t prepared well.”
Amanda : “Well, I’m sure you can do it. Just do your best.”
Sammy : “Thanks.”
Amanda : “By the way, I want you to meet Laura. She is the new student in my class. Laura, this is my friend, Sammy from Class 7 B.”
Sammy : “Oh, how do you do, Laura.”
Laura : “How do you do, too.”
Amanda : “So, Sammy, we are going to the canteen now. I’ll see you.”
Sammy : “Ok, I’ll see you too. It’s nice to meet you, Laura.”
Laura : “It’s nice to meet you too, Sammy.”

Based on the conversation, how long have Laura and Sammy known each other?

A. They are neighbors.
B. They have known each other since elementary school.
C. They never knew each other.
D. Not long, they are just met that day.

Question number 2 to 4 is based on the following conversation.