The speech contest will begin with a short presentation followed by a question-and-answer session when audience members will be chosen _______ in order to be fair.
| A．in general | B．by chance |
| C．on purpose | D．at random |
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 |
With five hungry children seated round the table, the food disappeared_____________.
| A．on time | B．in time | C．at no time | D．in no time |