She felt herself _______ by her friends.
| A．understand | B．understanding |
| C．understood | D．to understand |
It is uncertain ___________ side effect the medicine will bring about，although about two thousand patients have taken it.
| A．that |
| B．what |
| C．how |
| D．whether |
It never occurred to me ___________ you could succeed in persuading him to change his mind.
| A．which |
| B．what |
| C．that |
| D．if |
The football match was said ___________ in Rome last week.
| A．to have been held |
| B．to be holding |
| C．to hold |
| D．to have held |
___________ you may have, you should gather your courage to face the challenge.
| A．However a serious problem |
| B．What a serious problem |
| C．However serious a problem |
| D．What serious a problem |
During the days ___________, he worked as a servant at the Browns.
| A．followed |
| B．following |
| C．to follow |
| D．that followed |