Mary: Hello, Lucy! What are you doing? Lucy: I am sending some postcards. How about you? Mary: I’m sending a letter. Where are you sending your postcards? Lucy: I’m sending them to America. And where are you sending your letter? Mary: I’m sending it to Canada. Lucy: How much are the stamps? Mary: I think they are ten yuan or more. Lucy: That’s too expensive ( 昂贵的 ). Mary: I think so. Lucy: Why not send an email on th e computer? Mary: That’s a good idea. Let’s go and find a computer. Lucy: Can you write an email? Mary: Yes, I can.