Select an acceptable pronoun to complete this sentence. Every contestant should wear square best suit on Tuesday.

The correct pronoun to complete the sentence is "their." So, the completed sentence should be:"Every contestant should wear their best suit on Tuesday."Explanation:In modern English, "their" is often used as a singular, gender-neutral pronoun to refer to a person whose gender is not specified. This usage helps avoid gender bias and is widely accepted in both spoken and written language.