The real secret to successful learning lies in students____an interest in what they are doing.
_____ for your brother, I would not have gone to see Mr. Wang.
—— I usually go there by train. —— Why not_____by boat for a change?
I still remember the name of the village____we visited last year.
I think this is the first time that we have met.___anywhere.
During the war, ____but also he lost his wife and his child.