Explanation:

- The phrase "All agog" generally means being highly excited or overly eager, particularly in anticipation of something.

- Option 1: Unexpected

- This refers to something not foreseen or anticipated.

- Does not capture the eagerness or excitement implied by "all agog."

- Option 2: Dispute

- This means to argue about something or disagree.

- It doesn't express eagerness or excitement either.

- Option 3: Expectant

- This means having or showing an excited feeling that something is about to happen, especially something good.

- Perfectly matches the meaning of "all agog."

- Option 4: Deceive

- This means to trick or mislead someone.

- It's unrelated to the eager anticipation described by "all agog."