Multiple choice

Directions: Fill in the blanks with the suitable option.

_______ unknown quantities is the task of algebra.

  1. To found

  2. Find

  3. The find

  4. Finding
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a verb functions as the subject of a sentence, it must be in the gerund form (-ing). 'Finding unknown quantities' correctly places the activity in the subject position. Option A incorrectly uses 'found' instead of 'find' in the infinitive. Option B uses the base form, and Option C unnecessarily adds an article 'the'.

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