The reason__________ their failure you know is they didn't get fully prepared for the experiment.
| A．why.., that | B．that.., why |
| C．for.., that | D．why.., because |
It is nearly seven o’clock. Jack be here at any moment.
| A．shall | B．can | C．need | D．should |
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 |