I wonder whether I ........ ever see him again.

Answer: would

Sentence: I wonder whether I would ever see him again

Explanation:

"Would" is used here to express a tentative or hypothetical attitude toward a possible future event. It conveys the speaker's doubt and speculation about seeing the person again.

• shall: Not appropriate. "Shall" is archaic in first-person usage and is typically used for offers, suggestions, or formal statements, not for expressing uncertainty.

• will: Grammatically possible in casual speech, but it expresses a straightforward future. It is less tentative than "would," so it does not match the doubtful tone as well.

• should: Incorrect. "Should" implies obligation, expectation, or advisability rather than simple uncertainty about whether something will happen.

• would: Correct. Conveys a hypothetical or tentative view of the future, matching the speaker's wondering.