Answer:

One of my unforgettable moments in school was about my friend's bag which flew under the dining table at the school cafeteria while I was unnoticingly eating. I bursted out in laughter. I couldn't hardly breathe because I was laughing hardly.

It was really funny to watch your friend's bag fly off the table without him noticing it. My friend was talking with a kid while I tried too hard to stop laughing. So, I took a deep breath. I was nervously looking under the table, seeing the empty bag lay on the ground. It was terribly horrifying to tell him about it at the same time because I don't want to make him mad.

Note: I can't encircle the adverbs. But, I hope this helps.