阅读短文，判断下列句子正误。

    It's warm on Sunday. My father is writing a book about my family. My sister is reading a magazine in the living room. My brother is making posters about his class. My baby brother is sleeping. My mother is cooking in the kitchen. What am I doing? I am watching them. Because of the fine day, we decide to climb a mountain in the afternoon. What a nice day!