No hay nadie en la clase.
You should not put "alguien" because that means somebody.
Answer: Hmmm i think it's the second one tho :o
Explanation:
Present: escucho, escuchas, escucha, escuchamos, escucháis, escuchan
pretérito: escuché, escuchaste, escuchó, escuchamos, escuchasteis, escucharon
BTW you can find any conjugation to any verb on Spanishdict.com
The significance of dominoes in the Spanish-speaking world is that people use them as a connection to the past.