We _______ on this project for four hours. Let’s have a rest.
| A．are working | B．have been working |
| C．worked | D．had worked |
John says that his present job does not provide him with enough _____ for his organizing ability.
| A．scope | B．space | C．capacity | D．range |
The meeting was _____ when the chairman fell ill.
| A．put down | B．shut out | C．cut short | D．taken off |
The members of the club wouldn't run a _____ in entrusting（委托） the organization to an unreliable person.
| A．danger | B．risk | C．hazard | D．chance |
Many new _____ will be opened up in the future for those with a university education.
| A．opportunities | B．realities | C．necessities | D．probabilities |
It isn't quite _____ that he will be present at the meeting.
| A．sure | B．right | C．exact | D．certain |