The correct word to fill the first blank is baila.
1. Marcos baila cada noche.
The correct word to fill the second blank is está corriendo
2. En el parque , hay una persona que está corriendo.
The correct word to fill the last blank is les gusta.
3. A Ana y Sara les gusta el libro.
It might be different by the Spanish-speaking country's standards. Maybe you might be confused by what the doctor is saying because you don't speak Spanish well. Maybe the procedure/checkup you're having is different from what you are used in the country you lived at before you visited this country.
Answer:
tengo, tienes, tienen, tememos, tieneis, tendreis.
Explanation: