At the foot of the mountain, __________ .
It was a matter of________ would take the position.
In China, all the students work hard at school _________ going to university for higher education in the future.
Robert is said ___________ abroad, but I don’t know what country he studied in .
He made another wonderful discovery, ______ of great importance to science.
Was it through Mary, _____ was working at a high school, ____ you got to know Tom?