Usted. It is in formal form since she is your teacher.
Answer:
cantan
Explanation:
Because it makes sense in english it would be
Jose and Pedro are going to sing this song.
and if you were to use cantamos it would be
Jose and Pedro are going we sing this song.
It doesn't make sense at all.
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Felices ; los chicos son felices
1. Es una chica rubia.
2. Está embarazada.
3. Va a tener un bebé.
4. Su vestido es de color rosa.