Measures must be taken before there is another collapse of the coal mine, ______?

What are you doing,Mum?—I am______the carpet in order to get rid of the dust in it.

It was in the village _____ we used to live ______ the film was made.

Though we take a great risk of investing in theproject, yet it will ______ in the long run.

The teacher suggested the dictionary at once.