Multiple choice

______ off the Hawaiian coastline are living others are death.

  1. Coral reefs

  2. there are many types of coral reefs

  3. some types of coral reefs

  4. while some types of coral reefs
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The sentence contains two contrasting clauses: one about living reefs and one about dead reefs ("others are dead"). The subordinating conjunction "while" is required to connect these two clauses and establish the contrast. Without "while", the sentence would be a run-on with two independent clauses joined only by a comma.

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