Yadin extend an ______ to young people from all over the world to join him in digging at Masada.

A．To save 3 dollars.
B．To buy it at once.
C．To ask 3 dollars from the parent.
D．To save 5 dollars.

A．By doing business.
B．By buying and selling land.
C．By cheating.
D．By making whiskey.