1. The fashionable dress __________ (design) by Cheng Yifei last year.
2. Would you mind __________ (click) the icon at once?
3. You need __________ (finish) your homework today.
4. I _________ (know) the boy since 1993.
5. —I want to return the book to Jack, but I can't find him. 
   —He __________ (go) to the library. You can find him there.
6. —What do you think of the new book by Han Han?
    —Wonderful! I __________ (not read) such a good book before.