It is a long time ________ they separated, but it won’t be long ________ they meet again.
Every time_____they met, they would talk several hours together about all of the situations_____ appear in the working world.
It_____we had stayed together for several weeks_____ I found we had a lot in common.
You_____ all those calculations! We have a computer to do that sort of thing.
—_____I stay with you?— Well, I would rather you_____me alone for a while.
Mr. Black is a careful and experienfed engineer, so he is often _____ to finish some challenging tasks.