Fill in the blank with the appropriate modal verb:

You _____ bring your passport and examination entry slip to the hall; without them, entry is strictly forbidden.

Answer and explanation

Correct answer: D. must

  1. Step 1: Analyze the degree of deontic obligation required: the secondary clause ("without them, entry is strictly forbidden") signals that carrying the documents is a mandatory, non-negotiable rule.
  2. Step 2: Select the modal auxiliary conveying imperative necessity: "must" denotes compulsory necessity and obligatory compliance imposed by official examination rules.
Answer
must.
Why not the others: "might" and "could" express tentative possibility or conditional ability; "may" conveys permission or possibility, failing to express mandatory requirement.

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