When the telephone rang, I happened_____ a book.
We haven't discussed yet _____ we are going to place our new furniture.
The company has been in my _____ for more than a year.
His movie won several awards at the film festival, _____ was beyond his wildest dream.
I can't manage _____ a good night's sleep if I am to do a good day's work.
My argument is _____ on fact.