根据上下文补上所缺的单词的ing形式，使短文完整。

Everybody is very busy. Grandpa is _______ a letter. Grandma is _______ a book. Dad is ______ in the study. Mom is _______ dinner in the kitchen. Brother is _______ to music. Sister is _______ the room. I am _______ pictures. Uncle is ________ the phone. Aunt is ______ clothes. Cousin is _____ homework.