The men have not ______ debate.

Here are the solutions to the questions:

53. Walter didn't...
The main clause "Walter didn't" is a negative statement in the past simple tense. The question tag for a negative statement uses a positive auxiliary verb and the subject pronoun. Since "didn't" is the auxiliary verb and "Walter" is the subject (he), the correct tag is "did he".
The complete sentence would be "Walter didn't come, did he?"
The correct option is D.

• D. did he

54. The men have not...
The phrase "have not" requires a past participle. We need to choose between the past participles of "lie" (to recline) and "lay" (to place something).

• "Lie" (to recline) has forms: lie (present), lay (past simple), lain (past participle).
• "Lay" (to place) has forms: lay (present), laid (past simple), laid (past participle). Since there is no object after the blank, the intransitive verb "lie" (to recline) is appropriate. Therefore, the past participle "lain" is the correct choice. The correct option is A.

• A. lain

55. I enjoyed this me...
The sentence structure likely implies "I enjoyed this [noun] of yours." This requires a possessive pronoun.

• "your's" and "yours'" are incorrect as possessive pronouns do not use apostrophes.
• "your" is a possessive adjective and needs a noun immediately after it (e.g., "your book").
• "yours" is the correct possessive pronoun. The correct option is B.

• B. yours

56. None of us is ___ debate.
This sentence requires a preposition to complete the phrase.

• "in debate" is an idiomatic expression meaning to be actively involved in a discussion or argument.
• "at debate," "for debate," and "on debate" are not standard idiomatic phrases in this context. The correct option is A.

• A. in