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)
