100. Environment and pollution (Asking for and giving advice)

A: What can we do to about all this air pollution?

B: We can ride our bikes and walk instead of letting our parents drive us everywhere.

A: That's a great idea. Let's start biking to school!

B: It's also helpful to plant more trees and use air conditioning less. A: We really should take all these steps to protect the environment.

B: We should. People who don’t are just being lazy and killing our planet!