现在进行时构成 be+doing — 英语填空题

根据括号内的中文提示，用现在进行时（be+动词ing）补全句子，每空一词：Tom is in the park now. He ___ (play) football, and his two friends ___ (run) on the grass. Their teacher, Miss Green, ___ (sit) under a tree. But Tom's little sister isn't ___ (sing); she ___ (sleep) in the car.