Directions: Select the suitable conjunction to complete the sentence: It's all…

Answer: "since"

Why this is correct:

• "since" means "because" and expresses the reason. "It's all sewn up since you apologized" = Everything is settled because you apologized.

• "if" introduces a condition. "It's all sewn up if you apologized" would mean it is settled only on the condition that you apologized, leaving it uncertain rather than stating the reason.

• "although" introduces contrast. "It's all sewn up although you apologized" would imply the apology did not help, which contradicts the intended meaning.

• "unless" means "except if" and would reverse the meaning: "It's all sewn up unless you apologized" implies it is settled except when you apologized, which is not the intended idea.

Therefore, "since" is the most appropriate conjunction to express the reason.

Complete sentence: It's all sewn up since you apologized.