The public transportation in this city is very convenient，where many buses run _________ 。
| A．occasionally | B．approximately |
| C．immediately | D．frequently |
Although he had only entered the contest for fun, _____ he won first prize.
| A．but | B．and |
| C．even | D．不填 |
Just because they make more money than I do, _____ they seem to look down on me.
| A．so | B．and |
| C．but | D．不填 |
He was not an actor, who often appeared on stage, _____ a writer, writing stories.
| A．but | B．and |
| C．then | D．so |
The point is not who said the words, _____ they are true or not.
| A．but whether | B．and whether |
| C．but how | D．and how |
I’m sorry, _____ I won’t be able to come tonight.
| A．for | B．and |
| C．but | D．then |