2. I decided to become a human/volunteer to help the planet.
volunteer
3. Some cars disappear/pollute the environment more than others.
pollute
5. Claire’s dad can’t stand the rubbish/traffic when he goes to work in the morning.
traffic
1. Is your father planning/solving a barbecue on Saturday?
planning
Why don’t we put up/take off posters about the beach clean-up?
put up
4. Flying cars might be empty/available to everyone in the future.
available