用所给词的正确形式填空。
【小题1】Listen! Someone ______ (sing) in the music room.
【小题2】Why ______ (do) they like running?
【小题3】He ______ (not like) playing basketball. He ______ (like) playing tennis.
【小题4】She sometimes ______ (go) to school on foot.
【小题5】My hobby is skating. Is skating ______ (you) hobby?
【小题6】I often help my mum ______ (clean) the windows on Sundays.