It was the training __________ he had as a young man __________ made him such a good engineer.
Cathy went to the hospital alone. If she had told me about it, I _____ with her.
Of all the books on the desk, ______ is of any use for study.
Sam _____ some knowledge of the computer just by watching others working on it.
A new iPad in the market costs about ______ of a second-hand one.
By the time we arrived at the railway station, the train _________. As a result, we missed the train.