In many cities of China, if an ambulance is_______ in a traffic jam, police will respond to the emergency.
| A．held up | B．held back |
| C．held down | D．held out |
The discovery of the new drug is of great ____ to people who suffer from heart problems.
| A．appreciation | B．significance | C．satisfaction | D．guidance |
In the job interviews job applicants often find themselves asked unexpected questions, some very difficult ____.
| A．to be answered | B．to answer | C．being answered | D．answering |
The policeman kept his eyes________on the screen of the computer to identify the criminal's footprints.
| A．fixing | B．fixed | C．to fix | D．being fixed |
If we ______ day before yesterday, we would have done the job.
| A．hadn't been interrupted | B．weren't being interrupted |
| C．wouldn't be interrupted | D．weren't interrupted |
You _____ me because I didn't say that.
| A．may misunderstand | B．must misunderstand |
| C．should have misunderstood | D．must have misunderstood |