Read the passage and choose the word (marked a, b, c or d) that best fits the space

 

John Baines is an (1)_________. He is interested in all things to do with the environment and the need to protect it. Two years ago, he got his bicycle out of the garage and repaired it,and now he uses it as much as possible. He uses his car (2)__________. When he does shopping, he always walks now. He uses public transport when he can, usually going by bus. His car runs on unleaded petrol because it is cheaper and it keeps the air (3)_________. About in the home, he saves as much as he can. He doesn’t throw garbage (4)_______. He has different bags for different things. One bag has all the cans going into it, the second has all the papers going into it, and the third has bottles such as oil bottles, wine bottles, but not milk bottles because they can be (5)________. He takes these bags to places where they can be recycled.

John Baines is an (1)_________.