1.      We should be responsible for the _________________ humans are doing to the environment. (destroy)

2.      Demonstrations were held as a gesture of  _________________ with the hunger strikers. (solid)

3.      People are destroying the air by adding _______________ to it. (pollute)

4.      We offer a very _____________ rate for parcels of under 15 kg. (compete)

5.      The species of bird is ______________ in number every year. (decrease)