——Why did I make such a silly decision? I really feel upset.
——_______. Even the wise are not always free from error.
| A．Come on | B．Cheers | C．That’s all right | D．No problem |
It was never clear ___________ the man hadn't reported the accident sooner.
| A．that |
| B．how |
| C．when |
| D．why |
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 |