21.   When you open the control valve the liquid is released into the stove burner as a gas.

22.   The bears are eventually released into the wild.

23.   Oil was released into the sea.

24.   Each bird was tagged and released into the wild.

25.   There is a lot of controversy over whether or not wolves should be released into the park.

26.   The wildlife refuge raises endangered species in captivity and then releases them into the wild.

27.   Hormones are released into the body in response to emotional stress.

28.   Heat is released into the atmosphere by cars.

29.   Thus fluorinated gases released into the air by chemical works can get into the sewers as liquids.

30.   No product can be released into the environment without the prior authorisation of the relevant controlling body.