--The window is dirty.
----I know. It ______ for weeks.
| A．hasn’t cleaned | B．didn’t clean |
| C．wasn’t cleaned | D．hasn’t been cleaned |
As he didn’t have much money, he had to ____ a second- hand computer for his work.
| A．pick up | B．give up | C．look up | D．take up |
The newspaper reporter interviewed the old man and ___ his family history.
| A．checked up | B．went through | C．cleared up | D．reminded of |
___ the words the boy said at the meeting were true. We must not believe ____ he said. Only a few of them are helpful to us.
| A．None of; anything | B．All; nothing |
| C．Not all of; everything | D．Neither of; something |
When she woke up, she realized that things she had dreamed of could not ___ have happened.
| A．possibly | B．likely | C．hardly | D．usually |
He ____ this bike for 600 yuan. Though it was a bit expensive, I think it was reasonable.
| A．paid | B．charged | C．offered | D．cost |