What's your attitude __________ that problem?
| A．towards |
| B．of |
| C．with |
| D．at |
Jack is the right person you can rely on to ____ the research when you are on vacation for the next two weeks.
| A．carry on | B．focus on |
| C．take up | D．insist on |
He failed the final examination and only then ____ how much time he had wasted.
| A．he realized | B．had he realized |
| C．he had realized | D．did he realize |
Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land, thus _____it less fertile.
| A．make | B．to make |
| C．made | D．making |
When the area was _______ by the flood, the government organized people to send food and medicine there immediately.
| A．cut away | B．cut down |
| C．cut off | D．cut up |
People should ______the traffic rules when they travel to a new place. Nobody can be exception.
| A．perform | B．observe |
| C．possess | D．support |