The medicine has a strong side ________ on our health though it works well.
—__________ that he gave up smoking and drinking? —Oh, his girlfriend helped him.
What a pity it was that the film star died from an accident __________ his film unfinished.
__________ the train arrived, some people were waiting inside the station __________ others were heading for the platform.
It was __________ fan that we couldn't hear anything.
Gunpowder,__________ we all know, was invented in ancient China.