2. Listen! Mary ________ (sing). She ________ often ________ (not/sing), she often ________ (paint).

Ответ: is singing, is, not singing, paints

1. Listen! Mary is singing (sing). (Present Continuous для действия, происходящего сейчас.)
2. She is often not singing (not/sing), she often paints (paint). (Present Simple для обычных, повторяющихся действий.)

Ответ: is singing, is, not singing, paints