The room is in a terrible mess; it        have been cleaned.

          — _____ you find _______ ways to work out this problem, Jim? — Yes, I ______.

I think that's unlikely to happen, but if that ______ occur, both America's and China's interest would be severely damaged.

----Did you go to the cinema last night? ----No, We    , but our car broke down on the way.

 You _____ get the machine repaired this week. I won’t need it until next month.