In ____late 19th century, computers changed _____great deal and were widely used______international trade.
| A．the; a; the | B．the; the;不填 | C．the; a; an | D．the; a; 不填 |
Efforts to stop smoking in public areas _______ progress in Hangzhou in recent weeks．
| A．made | B．have been made | C．have been making | D．are making |
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 |