Was it in the school reading room _____ you found the missing book?

.As I grew up in a small town at the foot of a mountain, the visit to the village_____ scenes of my childhood. 

----Have you known Professor Jackson in our department for a long time ? ----Yes, since he _____ the our university.

—How do you find your new classmates?—Most of them are kind, but ____ is so good to me as Bruce.

They use computers to keep the traffic _______ smoothly.