Question

The search engine business model _____ around the fulcrum of trust

Answer 1

"Revolves" here denotes as "based on".

Answer 2

The sentence after filling up the blank is following - The search engine business model revolves around the fulcrum of trust.

A sentence can be referred as the set of the words which is complete.

It typically contains a subject and a predicate and can convey a certain statement, exclamation, question or command.

It has a main clause and one or more than one subordinate clauses.