How dirty the windows are! They really require _______.
| A．to clean | B．being cleaned | C．to have cleaned | D．cleaning |
Our son doesn’t know what to ______ at the university；he can’t make up his mind about his future.
| A．take in | B．take up | C．take over | D．take after |
I’m living in the apartment nearby. Come and see me whenever________.
| A．it is convenient | B．you are convenient |
| C．you have convenience | D．there is convenience |
—I hear that you will be on travel again.
—Yeah. My boss __________ for me to discuss business details with someone from another company.
| A．asked | B．arranged | C．sent | D．called |
Not until the early years of the 19th century ________ what heat was.
| A．man did know | B．did man knew | C．didn't man know | D．did man know |
__________cleaning the yard and making up the beds for the old，we also read newspapers for them and had chats with them.
| A．Except for | B．Rather than | C．Apart from | D．Instead of |