(38~43) Bob: What are you reading? Ada: A postcard from Russia. Bob: You have a friend  38  ? Ada: Well, not really. Emilia,  39  sent me this postcard, lives in Russia. I don’t even know her. Bob: I don’t get it. Why did Emilia send you a postcard if you don’t know her? Ada: There’s a website called “Postcrossing” which allows anyone to send and receive postcards from all over the world. Bob: Sounds interesting.  40  Ada: First, you need to (41) sign up to join it. Then, you can get your own register number and ask for an address  42  which you mail a postcard. For each postcard you send, you will receive one back from another postcrosser. Bob: Wow, I want to become a postcrosser, too. How much do I have to pay for it? Ada: Nothing! Sounds great, right ? Bob: It does. I’ll give it a try for sure. By the way, I like the beautiful church on your postcard.
40.
(A) How does it work?
(B) Where can I find it?
(C) Who is interested in it?
(D) What’s so special about it?