The government has promised to_________the matter and will give the workers a satisfactory answer.
He stayed there for quite a long time, during ________ time he learned much spoken English.
The man showed us so heavy a stone ________ no man can lift.
Some pictures of the river brought the days back to the old ________ they swam in it.
Is this research center ________ you visited the modern equipment last year?
The humans are destroying nature day by day, ________ of course, will cause severe punishment from it sooner or later.