9731 question tags

Mary is cleaning the house now, ……………… …….? Peter bought an ice-cream, ……………… ….? He is a doctor, ……………… ….? Stop singing ……………… ….? My friend has been writing a compositio n since p.m., ……….? She decided to prepare the dinner, ……………… ……? Mike has got a new computer, ……………… ……? Alice likes to knit, ……………… ……? Ann picked flowers for her mother, ……………… ……? She was playing with her toys for an hour, ……………… ……?