Multiple choice

Directions: This question presents a sentence, all or part of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

Chlorofluorocarbons, used as propellants in aerosol cans, are especially harmful pollutants since they contribute to making the hole in the Ozone layer bigger.

  1. are especially harmful pollutants since they contribute to making the hole in the Ozone layer bigger

  2. are specially harmful pollutants since they contribute to making the hole in the Ozone layer bigger

  3. contribute to making the hole in the Ozone layer bigger than before, and hence, are especially harmful pollutants

  4. specially harmful pollutants, contribute to making the hole in the Ozone layer bigger

  5. are especially harmful as pollutants since they contribute to making the hole in the Ozone layer bigger
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Option 1, the given sentence, is grammatically correct. 

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