What's that?
fast
What's that?
convenient
What's that?
green
What's that?
unhealthy
What's that?
comfortable
What's that?
easy
What's that?
slow
What's that?
safe
What's that?
dangerous
What's that?
difficult
What's that?
healthy
What's that?
uncomfortable
What's that?
inconvenient
What's that?
polluting