А)
— What are you doing now?
— I'm answering the questions of the Teenager's Competition at the moment.
— Are the questions difficult?
— Not for me. We often answer similar questions on our English lessons.
b)
— Have you took part in the competition recently?
— Yes, I tried my chance two weeks ago.
— Did you won the competition?
— No, I didn't. But it was worth trying.