Multiple choice

Directions: Fill in the blank with an appropriate word.

For a blue moon to ________, the first of the full moons must appear at or near the beginning of the month so that the second will fall within the same month.

  1. happen

  2. occur

  3. see

  4. visible
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Occur is the standard verb used to describe the happening of natural phenomena like a blue moon. Happen is also possible, but occur is more formal and precise in this context.

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