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. |
Since the new director took office, we have worked ___hours, －that is to say, we work more freely.
| A．flexible | B．compulsory | C．strict | D．endless |
___ is well-known to all is that the 2010 Shanghai World Expo has been brought to an end.
| A．As | B．That | C．What | D．It |
Those successful deaf dancers think that dancing is an activity sight matters more than hearing.
| A．when | B．whose | C．which | D．where |
the secret of nature, they young scientist has little time for entertainment.
| A．Devoted to betray | B．Devoting himself to bring to light |
| C．Devoted to unearthing | D．Devoting to exploring |
Her excellent performance in the competition proved that she was a winner.
| A．value | B．worthy | C．worth | D．worthwhile |