If _____ for an explanation for an advanced camera, I would certainly find it difficult.
We're leaving at six o'clock , and hope _____ most of the journey by lunch time .
I _____ you somewhere before , but your name has escaped me _____ moment .
It's nearly seven o'clock . Jack _____ be here at any moment .
______ professional violinist practises for several hours a day , but ______ violinist has his own way of playing the Beethoven concert .
The rescue team ______to help but failed to get there in time.