I was about to leave the office ______ an unexpected visitor came.
| A．while | B．as | C．when | D．before |
According to the police, their conclusion about the case was based on the _______ from several prisoners, so it was reliable.
| A．identity | B．evidence | C．forecast | D．outline |
Professional and skilled as she is in drama, there are __________ when she can make some funny mistakes while acting in a movie.
| A．situations |
| B．occasions |
| C．scenes |
| D．conditions |
You'd better __________ your scores and see if you have passed the exam.
| A．add up |
| B．go through |
| C．set down |
| D．come up |
Remember, at any given moment, you are in __________ with one per-son and one person only-yourself.
| A．competition |
| B．contrast |
| C．connection |
| D．league |
Without the contribution of Qian Xuesen, China __________ such great achievements in space technology.
| A．wouldn't make |
| B．can't make |
| C．shouldn't have made |
| D．wouldn't have made |