51. George Washington was born in 1732 in a rich family in _______ is now the state of Virginia.
| A．which | B．where | C．that | D．what |
If we work with a strong will, we can ______ any difficulty, however great it is.
| A．overturn | B．overtake |
| C．overcome | D．overwork |
Some smoking and alcoholic drinks are a (n) ______ taste and are not inborn.
| A．gained | B．developed |
| C．acquired | D．grown |
Whatever he explained, he couldn't ______ the policeman that he was innocent.
| A．confirm | B．present |
| C．convince | D．admit |
It ______ ，for there is no one that can be relied on.
| A．let me down | B．let on |
| C．let out | D．let off |
The final examination is coming up soon. It's time for us to ______ our studies.
| A．get down to | B．get out |
| C．get back | D．get over |