A brilliant idea occurred to him, to his research in the lab.
| A．while devoting | B．while devoting himself |
| C．while he was devoted | D．while devoted |
It is much easier to talk about social change than to ___ .
| A．bring it on | B．bring it about | C．bring it up | D．bring it out |
As far as we know, Tom spends at least as much time watching TV as he _.
| A．does writing | B．writes | C．writing | D．does to write |
This is a story completely_____ by him, so don’t rust him.
| A．discovered | B．invented | C．found | D．known |
I can guess you were in a hurry. You _your sweater inside out.
| A．had worn | B．wore | C．are wearing | D．were wearing |
Historical experience can ____ as a most important source of information.
| A．serve | B．use | C．regard | D．prove |