Uh-huh, uh-huh, even parents ask such questions, but they are really free. Actually, they are for teachers. It was there that my Xiong Haizi spent two hours in physics, which cost me 8000 yuan. After listening, I had to learn from his teacher. I said we'll think about it at home. Xiong Haizi didn't do it anyway, so I had to follow him. After 20 classes, my grades are ok, and now I have more than 60 points.