— The room is dirty.
— I know. It ______ for several weeks.
| A．hasn’t cleaned | B．didn’t clean | C．wasn’t cleaned | D．hasn’t been cleaned |
The result might not as satisfactory as expected but the ________ on his face told us that he was very happy.
| A．expression | B．impression | C．celebration | D．appearance |
______ to as much English as possible is a good way to learn English well.
| A．Exposed | B．Being exposed | C．Having exposed | D．To expose |
-- What do you think of ____opening ceremony of the national games?
--It is simple but ____great success.
| A．an; a | B．the; a | C．a; the | D．the; the |
The wireless video camera is ________to send its video signal to a nearby base station，allowing it to be viewed on a computer or a television．
| A．persuaded | B．pretended | C．intended | D．advised |
________about the result of the experiment，he still wants to give it a try．
| A．Uncertain as he is | B．As uncertain he is |
| C．As he is uncertain | D．Uncertain is he as |