One night, I (listen) to music in my room when there was a knock on the door, then I heard a voice “Would you mind my (come) in?”I turned down the CD player. Then I said,“Come in, please!”It was my friend Tony. There was a book in his hand. He came to my home to return my book. He also brought me a poster. It said there was a big clothing sale in a shop. He asked me if I would like (buy) one. I told him I didn’t like new clothes at all. Perhaps it was not polite ___(say) no to him. Then he left my room right away. But I wasn’t annoyed.