Final answer:
The statement '... as [adjective/adverb] as ...' is completed with a Comparative (option 1). This form is used to compare two entities with the same degree of an adjective or adverb.
Step-by-step explanation:
The incomplete statement '… as [adjective/adverb] as…' can be completed using option (1) Comparative, not (2) Superlative or (3) Positive, as comparatives are used to show the relationship between two entities by demonstrating differences in degree, quality, or quantity. The structure typically employs adjectives or adverbs to compare two things. For example, in the sentence 'The chocolate cake is as delicious as the vanilla one,' 'delicious' is the adjective being used comparatively to equate the level of deliciousness between the two cakes. It's important to note that not all comparatives use the 'as…as' structure, some use 'more' or 'less' in combination with the adjective or adverb.