She had just finished her homework ____ her mother asked her to practice playing the piano yesterday. 
| A．when | B．while | C．after | D．since |
By the time he realizes he ____ into a trap, it’ll be too late for him to do anything about it.
| A．walks | B．walked | C．has walked | D．had walked |
After studying in a medical college for five years, Jane _______ her job as a doctor in the countryside.
| A．set out | B．took over | C．took up | D．set up |
The president promised to keep all the board members _________ of how the negotiations were going on.
| A．inform | B．informing | C．be informed | D．informed |
What’s the noise ? It sounds as if it comes from upstairs.
--______. It must be the window-cleaner working , next door.
| A．I’m not sure | B．I hope not | C．I’d rather not | D．I don’t think so |
Parents now believe that there are obvious differences in their approach to educating children compared with _____ of their parents.
| A．those | B．that | C．one | D．ones |