People often use plastics to ______ wood or metal.
| A．in place of | B．take their place | C．take the place of | D．instead of |
The new machine，if _________ properly，will work at least ten years.
| A．use | B．using | C．being used | D．used |
—What were you doing when the telephone rang?
—I ______ away my books and ______ to bed.
| A．had just put;was going | B．was just putting;went |
| C．just put;had gone | D．have just put;gone |
I thought Jim would say something about his school report,but he ______ it.
| A．doesn’t mention | B．hadn’t mentioned | C．didn’t mention | D．hasn’t mentioned |
We found______ impossible to finish the work on time.
| A．that | B．one | C．it | D．this |
John received an invitation to a dinner, and with his work____, he gladly accepted it.
| A．finished | B．finishing | C．to finish | D．was finished |