----You haven’t said a word about the design ,Mike. What’s your idea?
----I’m sorry I _______ about something else just now.
| A．am thinking | B．thought | C．was thinking | D．had thought |
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 |
I spent five hours_____________ the book__________ I paid 10 dollars.
| A．reading; that | B．to read; for that | C．read; which | D．reading; for which |