Help the clumsy teenager explain his failed attempt to sneak back into the house.

"I tried my best, but unfortunately, I didn't walk _____ I thought I did, and the dog woke up everyone."

The correct answer is as quietly as.

We use "as + adverb + as" to compare actions. Because "walk" is an action verb, we need the adverb "quietly" rather than the adjective "quiet". The structure must remain "as...as" without mixing in comparatives like "more" or words like "than".