—Why do you look worried?— Because what I am really concerned about is _____my friend can do me a favor or not..
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.
It is amazing that the little boy can swim _____ the river _____ 100 metres wide.
There are _____ to show that a new, different city is coming out of its dark past.