Many companies ask their employees to sign a ......... of secrecy.

Answer: The correct word is bond.

Explanation: "Bond of secrecy" is a standard phrase meaning a formal written pledge to keep information confidential, so it fits the sentence well.

• agreement — A plausible choice; companies often sign confidentiality agreements. However, for this exact blank the phrase "bond of secrecy" is the more natural collocation.

• bond — Correct: denotes a formal pledge or obligation to keep matters secret.

• bondage — Incorrect: refers to physical restraint or slavery, not a document or pledge.

• espionage — Incorrect: means spying or intelligence activities, not something employees sign.