I fell asleep while working on this paper _______ the computer on.
| A．as | B．for | C．over | D．with |
The idea for the new machine came to Mr. Baker ______ to his invention recently.
| A．while devoting | B．while devoted |
| C．while he was devoted | D．while devoting himself. |
Professor Liu has ________ teach psychology since he came to the Central China Normal University.
| A．determination to | B．been determined to |
| C．been determining to | D．determined to |
---Any news about Bill Clinton?
----He left power three years ago and has a little now and a little then been ______.
| A．heard of since | B．heard since | C．heard before | D．heard of before |
If you want to sell your product you must _____ it.
| A．advertise | B．advertise for | C．advertise on | D．advertise to |
Are the parents who let their child who is ______ walk in the dark alone at night considerate?
| A．young enough | B．too young to | C．not old enough to | D．so young |