It is difficult for us to learn a lesson in life _____ we’ve actually had that lesson .
.She has three brothers.___ is a doctor, ___ are PLA men.
I have two bicycles, ____ is made in Guangzhou;____ is made in Shanghai.
___ took them quite some time to finish the job.
The boy took ___ for granted that Mum would buy him some candy.
____ of the magaxines has been put in good order on the shelf.