The room is in a terrible mess; it ________have been cleaned.
16. -----What would you do if it tomorrow? -----We have to carry it on, since we’ve got everything ready. (05’全国卷)
15. we decided to spend the night at the foot of the mountain.
14. Give the book to wants it.
13. English we must work hard at it.
12. He said he was not optimistic the future of that country.