This computer can do millions of calculations per second.
Their grandfather needs glasses to read.
On the 12th of October 1492 Christopher Columbus arrived in America.
Thirty years ago people lived without mobile phones.
Our teacher has written twenty examples for us.
Si no has sacado un 10 en el examen, revisa todas las unidades anteriores y repite los ejercicios, todas las veces que haga falta, luego repite el examen 1.