The public transportation in this city is very convenient, where many buses run ______.
| A．occasionally | B．approximately | C．immediately | D．frequently |
Peter is my close friend, who can be what he promises.
| A．relied on to do | B．relied to do | C．relied on doing | D．relying to doing |
. Although the prices of TV set are , he managed to make the manager
the price of that TV set.
| A．going up; bring down | B．gone up; go down |
| C．going up; brought down | D．going down; bring up |
The discovery of how bronze is made was probably accidental, but it
to be an important event.
| A．turned over | B．turned about | C．turned out | D．turned off |
Mr. Smith had taught for many years, and all the students him.
| A．looked up to | B．looked up | C．looked up and down | D．looked to |
Please the invitations as soon as possible.
| A．send up | B．send out | C．send for | D．send in |