He will _____ our class to sing at the school singing contest.
| A．take place of | B．stand for | C．represent | D．representative of |
The new machine, if properly, will work for at least ten years.
| A．used | B．use | C．using | D．being used |
In the reading room, we found her at a desk, with her attention _____ on a book.
| A．sitting; fixing | B．seated; fixed |
| C．sit; fixing | D．sitting; to be fixed |
Someone my umbrella. It’s wet and it was wet in the last few days.
| A．was using | B．must have used |
| C．has been using | D．has used |
In America, it is often the judges, rather than the politicians make the big decision will affect people’s life.
| A．which; that | B．which; which |
| C．that; who | D．who; that |
Entering the yard, I found it _________ with lots of _______ leaves.
| A．covering; falling | B．covered; fallen |
| C．covered; falling | D．covering; fallen |