Помогите составить предложения Ski,well,my sister,my brother,not ski, well

Ski: I don't like riding on skis, because I think it is very dangerous. Well: You did this exam very well. My sister: My sister won the competition in Mathematics and won a medal. My brother: My brother isn't good at studying, that is why I always help him with his homework. Not ski: When we went to a ski centre, I did not ride on skis because I was scared to fall.