The group of research workers are said to ________ to the dangerous nuclear radiation while they carried out their rescue task.
| A．be exposed | B．have been exposed | C．exposed | D．be exposing |
The young man acted strangely during the interview. He made a bad ________on the employer.
| A．opinion | B．expression |
| C．experience | D．impression |
He asked us to _______ him in carrying through the plan at the meeting yesterday.
| A．persuade | B．encourage |
| C．assist | D．provide |
Today, we’ll discuss a number of cases _______ parents have much difficulty in communicating with their children.
| A．where | B．as | C．why | D．which |
He failed the mid-term examination and only then _______ how much time he had wasted.
| A．had he realized | B．did he realize |
| C．he had realized | D．he realized |
________confidence and the necessary equipment, they failed to rescue the 42 miners trapped in the coal mine.
| A．Having lacked | B．Lacking of |
| C．Lacking | D．Lack of |