Complete the text with suitable prepositions.

A teacher is an architect (a) _____ a nation. He plays an important role (b) _____ building up an educated nation. He dispels the darkness (c) _____ ignorance (d) _____ the lot of a nation. He is an actor, so to speak. He has to suit his act according (e) _____ the need of his audience which is his class. He is a clear speaker (f) _____ good, strong and pleasing voice which is (g) _____ his control. He does not sit motionless (h) _____ his class. Everybody has something valuable (i) _____ him. A good teacher discovers the treasure hidden inside each student. He also wants the students to be happy and for this he keeps them busy. A good teacher never hankers (j) _____ money.