Раскройте скобки, употребив глагол в Present Perfect Passive.
Examples: This article has just been translated. (Статья только что переведена).
The books have already been read. (Книги уже прочитаны).
1. The letter already (sent).
2. The book (read).
3. The house (build).
4. The room (clean).
5. Football (play) for hundreds of years.
6. The windows (open).