Radar enables the pilot of an airliner to take off, fly and land in _____.
| A．danger | B．comfort | C．continuity | D．safety |
The young manager is well known for his problem-solving skills, ________ is important for a successful leader.
| A．it | B．that | C．what | D．which |
Not until he had left his friend _______ how important friendship was for him.
| A．did he realize | B．he realized | C．had he realized | D．he had realized |
My father worked day and night. Otherwise, there ________ no one to support the family.
| A．would be | B．must be | C．would have been | D．must have been |
The interviewer will begin to judge you as soon as he or she ________ you in the waiting room.
| A．sees | B．will see | C．is seeing | D．saw |
When _________a career, you should consider all the aspects of a job.
| A．choose | B．choosing | C．chose | D．chosen |