Answer:
El futbolista mete un gol.
El jugador mete un gol.
Explanation:
El jugador, El futbolista is given to refer to a person, however,La porteria refers to an object , El equipo refers to a group as a whole, the most logical answer would be a person.
Ellos la quieren vender una casa.
Conjugating a verb? That's what I would call it, but honestly, not hundred percent sure what you are talking about.
Una nina- girl
Un nino- child, childish
Un hombre- Man
Un muchacho- Boy, youngster