Question

1. both hemispheres receive

sunlight about march 21st

Explanation:

This question is about the distribution of sunlight between the Northern and Southern hemispheres around March 21st, which is the spring equinox. During the equinoxes (March 21st and September 23rd approximately), the sun is directly above the equator, so both hemispheres receive approximately equal amounts of sunlight. The first blank should be "equal" (or "the same amount of") and the second blank might be related to the event, but based on the context of equinox, the key term for the sunlight distribution is equal.

Answer:

First blank: equal (or "the same amount of"); Second blank (if related to the event) : during (or "on")