Have you returned the book to him _______? Yes, I have______ returned it.
--- Are you from America? --- No, none of us.
---How often are the Olympic Games held? --- four years.
---I’m going for a summer camp in Beijing next month. --- .
---Are there any oranges in the bag? -- -Yes. But only .
---What’s wrong with me, doctor? --- . You just have a cold.