Choosing to visit the Shanghai Expo on a late afternoon can make you see two to three times as many of the most popular pavilions between 6 pm and closing time ____ you hurry.
| A．when | B．unless | C．where | D．if |
An excellent way to help memory is to connect information with pictures, which_____ as a memory---link method.
| A．considers | B．is considering | C．is considered | D．considered |
To work at home has been made _____ with the development of the Internet.
| A．it possible | B．it likely | C．likely | D．possible |
Let’s keep to the point or we ___________ any decisions．
| A．will never reach | B．have never reached | C．never reach | D．never reached |
In the Great Depression, the American government couldn’t find good solutions _____ the unemployment problem
| A．of | B．to | C．on | D．about |
In January, 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
| A．it marked | B．marking | C．marked | D．to mark |