The president was so absorbed in his work that not a sound ______.
| A．did she dare to make | B．dared she to make |
| C．she dared make | D．she did dare to make |
Steve and Jane are both very good ____ chemistry.
| A．at | B．for | C．in | D．on |
Do you often help your father ___ the farm work during the summer vacation?
| A．for | B．on | C．in | D．with |
Do you often help your father ___ the farm work during the summer vacation?
| A．for | B．on | C．in | D．with |
They sometimes go on working ____ the light of the moon.
| A．on | B．under | C．by | D．for |
He has never been to France, ___ Harry.
| A．neither has | B．nor did | C．so does | D．so has |