根据上下文补上所缺的单词的ing形式，使短文完整
(write do cook clean wash answer listen draw read work)
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.
，
，则直线
的倾斜角是（ ）
