Read the following conversation and answer the question.

W: James, you have a large collection of stamps, haven't you?

M: Yes, I'm really proud of it. I have thousands of stamps from most countries of the world.

W: Wow, that's great. How did you get all of them?

M: Sometimes I took used stamps off envelopes, but mostly my dad brought them back from his travels. Some of the stamps in my collection are of great value. Drop over sometime and I'll show you my collection.

W: Thanks, I will.

Question: What does the man think of some of the stamps? 

- They are all unusual.

- They are quite useful.

- They are very valuable.


They are very valuable.