Multiple choice

Directions: Fill in the blank with the correct adjective.

They made an ________ discovery.

  1. old

  2. young

  3. unique

  4. exciting

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The reference is to a novel act, which is exciting in a way. Young and old indicate age. Unique indicates one of a kind, which is not supported grammatically.