Question

complete the sentence with the correct comparative or superlative adverb.
badly
these two vacuum cleaners performed the
of all the models in the
demo.
submit

Explanation:

To complete the sentence, we need the superlative form of the adverb "badly". The superlative form of "badly" is "worst". The phrase "of all the models" indicates we should use the superlative to show the lowest performance among all models.

Answer:

worst