Mostrar is the verd to use. to show.
Answer:
Esta abierto (uno, dos, tres, cuatro, cinco, seis, siete) dia(s) a la semana.
Explanation:
Put the number of days after “abierto” and change the “dia” to “dias” if necessary
Correct answer : C. miran
English translation : Ricardo and Alberto look at the paintings in the exhibition