While watching television,______.
| A．the doorbell rang |
| B．the doorbell rings |
| C．we heard the doorbell rings |
| D．we heard the doorbell ring |
Drinking water, having a healthy diet and taking exercise are all positive ways to ________ you when you are working on a tight schedule.
| A．relieve | B．refresh |
| C．liberate | D．comfort |
—Why didn't Mr.Smith arrive on time for the meeting?
—He must have been ________ on his way here in the traffic jam.
| A．held up | B．put up |
| C．taken up | D．given up |
With economy developing at great speed, our city has ________ quite a few changes in recent years.
| A．witnessed | B．accumulated |
| C．arisen | D．introduced |
Many people are beginning to reflect on why we pay so much to study abroad and what kind of consequences it will ________.
| A．bring out | B．bring down |
| C．bring about | D．bring up |
The famous actor keeps fit by ________ for an hour every morning.
| A．sticking out | B．standing out |
| C．making out | D．working out |