With the boy______ the way, we had no diffaculty ______the village.
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.
The small mountain village we spent our holiday last month lies in is now part of Hubei.