In order to find the missing boy, the young couple all they can over the past twenty-four hours.
A．do B．did C．have been doing D．had done
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
