Three stickers

How do you earn 3 stickers in class in one day?

After his class was dismissed, Dominic ran out of his classroom proudly showing two stickers, 'The teacher gave me two stickers because I was very good in writing. I wrote "AUSTRALIA".'

'Very good,' I said.

And then he pointed to his left knee, which had a bandage.  He tells the story behind it, 'This morning, when we were lining up, I was running and a tall boy pushed me. But it was an accident.'

'Who put the bandage on your knee?', I asked.

'The teacher', he said.

And that's how he earned 3 stickers today.  Two proudly displayed on his bag. And a special one stuck on his knee.