They're working ______ (careful).
They're working carefully.
The dog barks ____ (loud).
The dog barks loudly.
I answered _____ (correct).
I answered correctly.
She's smiling _____ (happy).
She's smiling happily.
He runs ____ (fast).
He runs fast.
The baby sleeps _____ (quiet).
The baby sleeps quietly.
She runs _____ (quick).
She runs quickly.
She sings _____ (good).
She sings well.
He behaves _____ (terrible).
He behaves terribly.
He speaks _____ (slow).
He speaks slowly.