Make adverbs out of these words where possible:
happy
strong
loud
slow
complete
bad
good
mad
fast
sad

Sure, here are the adverbs formed from those words:

happy - happily
strong - strongly
loud - loudly
slow - slowly
complete - completely
bad - badly
good - well
mad - madly (can also mean "crazily" depending on the context)
fast - fast or quickly
sad - sadly