If you want to sound like a native, you need to change all the verb tenses. It should be "One day the students were having a painting lesson. Everyone began to draw a picture...
I noticed the same thing. This is something I've noticed with my Chinese colleagues; their English tends to avoid the past tense saying "I
draw the cat" instead of "I
drew the cat". The first phrase would only apply during the act of drawing before its completion.
The story is one I've read in English before, and it seems like this version has been translated from Chinese into English by a Chinese speaker. As for the question, I would write the sentence with 10 as "When I
gave it to you, the cat
ran away."