---- Did you meet the scientist at the airport?
--- No, he by the time I there.
| A．had left; got ; |
| B．has left; had got |
| C．was leaving; got |
| D．left; had got |
Some economists predict that the dollar will remain weak _______ economies abroad are expected to grow faster than that of the United States．
| A．while | B．as | C．before | D．until |
Advertisers are increasingly cautious about taking out ads _______ children, and that is hurting children’s magazines．
| A．being aimed at | B．aimed at | C．having aimed at | D．having been aimed at |
Until the start of the Industrial Revolution, mankind was poor, hungry, and constantly at the _______ of disease and natural disasters．
| A．power | B．limit | C．control | D．mercy |
Student loan is supposed to provide financial support for people who would _______ not be able to go to college．
| A．therefore | B．meanwhile | C．otherwise | D．nevertheless |
A new survey released by Yale University finds that Americans trust scientists most when ______ comes to information on climate change．
| A．that | B．it | C．this | D．there |