Hello Harry! ^^ Thank you for submitting your homework today. Kindly take note of the corrections that I made. Thank you! ^^

Harry: Q.In korea, what do they give each other?
Correct: In Korea, what are the things that people give to each other?
Explanation: Korea is a proper noun so it must start with a capital letter.
You should also work on constructing direct-to-the-point questions to avoid confusion from the receiver of it.

Harry:We give chocolate and candy too.but we can give chocolate to when who doesn't love him or her.when who just doesn't love him ,but doesn't hate him we can give chocolate or candy.(it's just for competition)
Correction: We give chocolate and candy, too. But we can also give it to persons that we are not affectionate with.
Explanation: Learn how to organize your thoughts first so that you will be able to convey your message well.