Vhich is a complete sentence? A leap year typically occurs every four years.
Let's spruce up this room new drapes would be an
improvement.

the first one

Explanation:

A leap year typically occurs every four years.

Let's spruce up this room new drapes would be an improvement isn't complete since there should be a period between room and new.

YOU KNOW THE RULES AND SO DO I

Explanation:

answer; interactionist persprctive;