1.   I unscrewed the cap and sniffed at a minute drop of liquid - it was odourless.

2.   I unscrewed the cap of the flask and very carefully poured in some scotch from the bottle.

3.   He had unscrewed the caps most of the way.

4.   She unscrewed the cap of her water bottle and gave him a drink.

5.   The officer unscrewed the cap and put the bottle to his nostrils.

6.   Willi unscrewed the cap from a metal flask and passed it to him.

7.   First, I unscrewed the cap from the drip device, freeing up the felt wick, and hung the entire rig from the bough of a beech nearby.

8.   Then he unscrewed the cap.