Recently I bought an ancient Chinese vase, _______ was very reasonable.
The two things are the same in outward form but different________.
We’d better discuss everything ________ before we work out the plan.
Those overseas students volunteer 10 hours each week in Paris ________ free food and accommodation.
—When did it begin to snow? —It started________the night.
Never put the medicine________the reach of your little child in case he takes it by mistake.