It's a chicken-and-egg question. I can't answer you now.           

——Do you want to watch this video?—— No, I think it’s ____. Let’s go to the movies.

—What about the English test yesterday?—I never did so______. I’m sure I can do very well.

---Have you returned the book to the library ____?   ---Yes, I have ____ returned it.

The famous writer is so ________ that he never shows off.