Unit 6. The environment

Mr.Brown is talking to some volunteer conservationists "I want every to listen carefully, please. First of all, I'd like you to devide into three groups. Each group should take five plastic bags. Once you have filled a bag, come back to me as you will need another. I need group one to walk along the shore. Group two should check the sand, and group three has to check among the rocks. Mr.Jones is going to collect all the bags and take them to the garbage dump.