You will succeed in the end ____ you give up halfway.
| A．even if | B．as though |
| C．as long as | D．unless |
Was it midnight_________ you fell asleep while reading with the candle still burning?
| A．when | B．then | C．that | D．in which |
She spoke very confidently because she wanted to make a great___________ on her employer．
| A．influence | B．pressure | C．impression | D．effect |
The achievements of the greatest minds in science could never have been reached________ the patient work of hundreds of others．
| A．were it not for | B．had it not been because |
| C．had it not been for | D．if it had not been |
The plans should be drawn as ________as possible，showing all the measurements．
| A．authentic | B．accurate | C．correct | D．proper |
In that south American country, _____bicycle is not_______ popular means of transportation．
| A．the；a | B．a；不填 | C．a：the | D．the；the |