_____around the clock for two days，he managed to finish the report for the manager on schedule．
| A．Working | B．Worked |
| C．Having worked | D．To work |
Miss Li _______ as a secretary for five years in the company, and now she is general manager of it.
| A．has served | B．had served | C．served | D．serves |
I heard the clock eight when I woke up.
| A．beating | B．striking | C．hitting | D．knocking |
We'll have to work the clock if we want to complete the work on time.
| A．beyond | B．over | C．against | D．from |
Much to my, I’m unable to accept your kind invitation.
| A．fault | B．duty | C．guide | D．regret |
In this workshop, the output of July was three times of January.
| A．that | B．this | C．one | D．it |