English

The word "interpolate" means to insert something, especially into a text or conversation. Therefore, "insert" is the correct synonym among the options provided.

A quorum is the minimum number of members required to be present for a meeting to be valid, so 'necessary number of members' correctly captures this meaning.

The word "bonanza" means a situation or event that creates a sudden increase in wealth, good fortune, or a windfall. Among the options, "windfall" is the closest synonym, meaning an unexpected gain or piece of good fortune.

The word 'repatriate' means to send someone back to their own country or to return home. Therefore, 'to return home' is the correct synonym.

The term "incommunicado" means not able or not allowed to communicate with others, often implying silence or secrecy. "Close-mouthed" is a synonym meaning unwilling to speak or reveal information, which aligns well with "incommunicado." Option D, "without means of communication," is a descriptive phrase but not a direct synonym.

A "redoubt" is a small, often temporary, fortification or defensive structure. Therefore, "fortification" is the most accurate synonym among the options provided.

The word 'acumen' means the ability to make good judgments and quick decisions, typically in a particular domain. 'Keenness' closely matches this meaning as it implies sharpness or quickness of perception, making it the best synonym among the options.

The word "chagrin" means distress or embarrassment at having failed or been humiliated. "Mortification" similarly means great embarrassment or shame, making it the correct synonym. The other options do not share this meaning.

The word "pedagogue" means a teacher or educator, so the synonym is "teacher." The other options do not share this meaning.

An 'overture' is an initial proposal or offer, especially in negotiations or discussions, making 'proposal' the closest synonym among the options provided.