__________ good exercise.
| A．Climbing hills is | B．Climbing the hill is |
| C．The climbing hills are | D．The climbing of hills are |
You will be successful in the interview __________ you have confidence.
| A．before |
| B．once |
| C．until |
| D．though |
These examples show that all individuals，__________ they are rich or poor, should be responsible __________ they are involved in law.
| A．if; when |
| B．if; as long as |
| C．whether; as long as |
| D．whether; since |
__________ 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 |
__________ we all tried our best, we lost the game in the end.
| A．As |
| B．Although |
| C．Because |
| D．Since |
__________ I couldn't fully under-stand what he wanted to show in his paintings, I thought his works quite impressive.
| A．As |
| B．Since |
| C．If |
| D．While |