English Conversation Practice - Running into Friend at Post Office

A: "Hey Robert. What are you doing here?"
B: "Hi Kevin. I need to buy some stamps. What about you?"
A: "I was checking my post office box, but my key won't work."
B: "Do you know why?"
A: "I think they canceled my account because I forgot to pay."
B: "That's too bad."
A: "Yeah. I use it for my business."
B: "How long have you been waiting?"
A: "I've been here since 8 am."
B: "That's 30 minutes."
A: "I know. It's been a long wait."
B: "There are still several people ahead of us."
A: "Many people left. They were tired of waiting."
B: "I don't think I can wait either. I have a dentist appointment at 9 am."
A: "I'm going to wait. I need to re-open my account."
B: "Yeah. I understand. I'm going to come back later."
A: "Ok. See you another time."
B: "Bye Kevin."

1. What is Robert doing at the Post Office?
Buying stamps
Checking his mail
Mailing a package
Checking his Post Office box

2. Why can't Kevin open his Post Office box?
He forgot to pay his bill
The key is broken
He can't remember his box number
His key was stolen

3. How long has Kevin been waiting in line?
15 minutes
30 minutes
45 minutes
One hour

4. What does Robert have at 9 am?
Doctor's appointment
Dentist appointment
Work
Church