根据短文内容,回答下列问题。

    My name is Wang Lin. Today is Sunday. It's my good friend Mary's twelfth birthday. Her parents are not in Beijing. We don't want Mary to feel lonely(孤独的)，so we have a party for her in my home. Jenny is good at singing, so she is singing an English song. Tony is playing the guitar. He has guitar lessons every Tuesday evening. He can play the guitar well. What is Nancy doing? She is dancing to the music. Nancy joins the school dance club and she goes there on Friday afternoon. Who is sitting on the bed? That is my little brother. He is eating an apple. It's his favorite fruit. What am I doing? I'm taking pictures of them. Now it's time for us to have the birthday cake. We all have a good time at the party.