As _______ general rule, the working temperature of the installation (设备) is _______ more important consideration than the working pressures.
| A．a; / | B．the; / | C．the; a | D．a; a |
The Internet connection for the entire area _________ when there was a sudden power cut yesterday.
| A．lost | B．was lost | C．had lost | D．had been lost |
American Indians _________ about five percent of the U.S. Population.
| A．fill up | B．bring up | C．make up | D．set up |
He once remarked that "All happy families ________ one another, but each unhappy family is unhappy in its own way".
| A．like | B．appear | C．resemble | D．represent |
China has a good ________ for fighting against the flu with its careful and smooth organization.
| A．reputation | B．influence | C．impression | D．knowledge |
Not knowing his address , she had some difficulty ________ his house.
| A．finding | B．to find | C．found | D．find |