Multiple choice

Directions: Fill in the blank with the correct option.

_______ they lose much of their mass due to friction.

  1. When the meteors enter the Earth's atmosphere,

  2. When meteor enters the Earth's atmosphere,

  3. When the meteor enters the Earth's atmosphere,

  4. When meteors enter the Earth's atmosphere,
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The main clause 'they lose much of their mass' refers to a plural noun. Therefore, the introductory 'when' clause must also use the plural 'meteors'.

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