Multiple choice

Directions: Choose the best out of the available options to fill the blank against the question.

The air inside a house or office building often has higher concentrations of contaminants ______ heavily polluted outside air.

  1. than does

  2. same as

  3. unlike

  4. like

  5. than is
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Comparisons with 'than' require auxiliary verbs when comparing subjects. 'Than does' correctly compares 'the air inside' with 'heavily polluted outside air'. 'Than is' would be incorrect because we're comparing subjects, not the air itself.

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