You have to be (careful / carefully) when you cross the street.
careful
Please be (quiet / quietly).
quiet
The velociraptor is (fast / fastly)
fast
The TV is too (loud / loudly).
loud
The eagle can fly very (fast / fastly).
fast
Snails are (slow / slowly).
slow
They are speaking (loud / loudly).
loudly
You have to listen to your teacher (careful / carefully)
carefully
The sloth moves (slow / slowly).
slowly
They are working (quiet / quietly).
quietly
Let's walk (quick / quickly) so we aren't late.
quickly