Choose the word that best completes the sentence:

It is ___ that regular exercise improves health.

Answer and explanation

Correct answer: B. well known

  1. Step 1: Use the meaning of the whole sentence: "well known" means widely recognised.
  2. Step 2: This is the word that fits the context.
Answer
well known.
Why not the others: hardly seen, secretly kept and poorly paid do not fit here.

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